Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85fc5c96001c66c…

MALICIOUS

PDF

93.2 KB Created: 2021-06-26 13:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9b5c4a56f668e3b3b344fbc95c95c7d1 SHA-1: 715658975acee70e66843687917f92c9a9de17f4 SHA-256: c85fc5c96001c66c25d9d817af9c29bef1a6f990595094b32b8fbeed6516da33
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566.002 Spearphishing Link

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, indicating a link farm designed to host malicious content. The 'SE_BRAND_CREDENTIAL_PHISH' heuristic specifically flags Facebook impersonation, and the presence of a 'SE_DOWNLOAD_BUTTON' lure suggests an attempt to trick the user into downloading a payload or navigating to a phishing page. The ML classifier and ClamAV detection strongly indicate malicious intent, likely credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=seven+pillars+of+information+literacy+was+introduced+by.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7dc1328ff---gekolamekeludedolaxumenew.pdf In PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/db7absjb1pjqlokbgbs0i3dgm7/pifojekexawajegum.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608a45f6846e9---doxawofikexopemola.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/b76cf26227b01f59bf813ee8fd49d38d/32039067482.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160d6961c04588---27367689317.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5287b4755---73358701321.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607b13177ef88---73138798330.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608cdf9d64e25---bonowefekivilejameb.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6172b1fe55510251364c32f762a436cd/fidezan.pdfIn PDF document text
    • http://jngf.cn/files/file/tukekituvatakex.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608832e9f24c8---109324942.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/dbd7ff847b270d2d57d594d26bb4ffe7/48760198161.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/18906112001.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/pemamewakojimov.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/cfa93ba9bcc333fd9993b5e613a1aae2/61418569517.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/towigodowakij.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607feaa5d2e8d---wivurigezujiminasexonipi.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/sf0bujl2ths1utkdov8bfmasqr/talujupi.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a978797ec6d---85475817518.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6955a554e---zobeteliwivejexubavapipu.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/tivivubajarobur.pdfIn PDF document text
    • http://malverne69.com/clients/a/a7/a743c233813d1a1dbf5c38c484d85cdc/File/baxanawiwudado.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827a72b3697---89420174602.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/sosevidibetedozefubib1620708691.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608acea6bc49f---1625143868.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=seven+pillars+of+information+literacy+was+introduced+byPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE0 11364 bytes
SHA-256: 0dbdbf3e5287866a253598de78eb4b2f1e31c0898d44a9f862ebea52b644169c
font_02_sfnt_off00013a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A79 17180 bytes
SHA-256: 0a498027fa273e79cd32da84259c20268d806bff7c928674ba4f3214b412cfe7