Malicious PDF — malware analysis report

Static analysis result for SHA-256 b394d455a229fae6…

MALICIOUS

PDF

94.3 KB Created: 2021-08-12 09:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 66a415c745fbeaa17b42bc7e51168732 SHA-1: 9ac2ddbb4c5c5c676719aa8836ac4e592b7cf269 SHA-256: b394d455a229fae696dcc70bd7ae91d985eca269bff800af5e51f2766b0a3272
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The presence of a 'download button' lure and explicit password instructions for an archive suggests a common tactic to bypass security filters by encrypting the actual payload. Multiple URLs point to compromised CMS uploads and link farms, likely serving as download locations for the concealed malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/96482814490.pdf In PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/ce8caf0fd4487a27770fd822e106fb8a/47575581399.pdfIn PDF document text
    • http://minniemleefamilyreunion.com/clients/4/46/4626b253669c69ed517e077132fb6553/File/ginid.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/9b7049cb7a62ce44344f51ee9cd2176c/kumubiforiwes.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160790f860de7d---7420750298.pdfIn PDF document text
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/34599403771.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecf5d5043a---84157936686.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/ej2ot022r3uamsdifb8nq0fu75/gazemukitotip.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder//userfiles/files/28065812053.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/85584282241.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/wivutofekarunutapaxosozu.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6bc090751---mozanoxuniwoxopavebom.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/d8b1f242f09659a7e04a864eb938dee9/11010101994.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c780c61c8e0---zitalufetowukix.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/794f238c9e69769d27e9a13c7bc3f08d/7496827673.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/rewopar.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/xasopivo.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/xitebopixizak.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/58695bd330e0118ac38a11b5e40fbd9c/51706456158.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/vujozitigevatabi.pdfIn PDF document text
    • https://efnnma.org/files/file/59930626382.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/79958343338.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/12204137471.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=god+of+war+chains+of+olympus+highly+compressed+psp+%28168mb%29PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10903 12032 bytes
SHA-256: 7232df37b3c281dafebf012829e24749c8476465d14c9484bdac1c5dc28fe429
font_02_sfnt_off0001259d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259D 17064 bytes
SHA-256: 3f1864f569cc1cad12a6f7e22f7108dbb0788629b2b24401ced65ef718698c04
font_03_sfnt_off00013cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC4 17288 bytes
SHA-256: a2a5b410f501c669cae771422a10f4c828dc6787dd493a05f74f54ff7445641e

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