Malicious PDF — malware analysis report

Static analysis result for SHA-256 856989004003c6de…

MALICIOUS

PDF

82.6 KB Created: 2021-07-09 09:36:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eb63adaf979b9d8116e36ca6e11ecc01 SHA-1: 018e5c44f8076091aa48259521a16c3253a94d46 SHA-256: 856989004003c6deb2cd6735c5cd0746dd63fdde329a50584e87eb77d42bd8e6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites, suggesting it's used to redirect users to malicious content. The primary function appears to be acting as a lure, directing users to external sites for potential phishing or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=the+power+of+yet+printable PDF link annotation
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/f16cec1bb077db8b22779ee51cc1854e/kuzifikiluban.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/17270234084.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a30a324b91c---dexolilodit.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/a1j9t3tmqnn81uj33ej4aggva0/98007709652.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf797fb419b---novuvirane.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cc3887597---vomotajavuwe.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/676361273b777f08258345bb0c9297f6/nojovokeru.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/witenutebavakodedib.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/39905837059.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11b09a88be---67898788898.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/206b96511b745440758e164acc917853/novumulafu.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160872ebe65707---31803782170.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/b7pjqcqi2v7v5q4vroi9he5vv6/xinupalotegivomadabuto.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/4899307373.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/k2ko022kfd3uj1hrvoi7e7n485/76628166199.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/43ee6257701377e2924d0cb4f1256160/24140920208.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/xosib.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/16af601cdd1ce13fa4c1fbc71bca1b79/virosetidukepenukav.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e6adea65971---tajik.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13660677834.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/7523792237.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/72ae7c9f0f5446965e751d6c51776b8e/sikidamolivefonev.pdfIn PDF document text
    • https://bkht.vn/userfiles/file/mesamube.pdfIn PDF document text
    • http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/vusowadego.pdfIn PDF document text
    • 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_off0000e29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29F 16404 bytes
SHA-256: 913e442c07a4c44448f86e639e54b1e4956a688ee6f650a5789092237f218701
font_01_sfnt_off00010cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12515 10588 bytes
SHA-256: 79d38aa55979051f676ed988ef0d1afa69d0f70cc2c4886b229d3cc822926ecb

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