Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4967e0909320661…

MALICIOUS

PDF

109.4 KB Created: 2021-09-24 01:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 105370497ae5d4bb7debebe3f6ebc0bf SHA-1: 8960f7c3c173ecf8da6434c71473fc4757474499 SHA-256: c4967e09093206614236a79adb36a36f1c5c5f36345342536d9a284515a50da5
216 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious files or conduct phishing. The presence of a 'Password-protected archive lure' heuristic indicates the document may be instructing users to open a password-protected file, a common tactic to bypass security scanners. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://krisoc.ru/uplcv?utm_term=is+android+better+than+blackberry PDF link annotation
    • http://fanghsin.com/uploads/files/202109221816565394.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/65821977983.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369acc2b9a3---19984411311.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/61633323392.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/pezesemezivisidako.pdfIn PDF document text
    • http://metabolit.ru/files/file/gofinipol.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/xolaf.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/nrr44b4ncjvueii82e6v6f1h23/nukam.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/324b38lin19j1cqld3f8aplo9s/92028731909.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c47109bab2---30653121354.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/xiforej.pdfIn PDF document text
    • http://csp.hu/editor_up/64882140199.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2073079ee---59284632090.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/1125188808.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/d5uepgabig9chfpequr84pm7h1/79868227360.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/29766547187.pdfIn PDF document text
    • http://methese.com/upload/files/zagokizuxo.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/56647338840.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/motuwe.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/bevebojefezuwomelumew.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8b0bca760---73475415647.pdfIn PDF document text
    • https://path.mn/userfiles/files/juvorufakidiponirino.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_off000142e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E4 10764 bytes
SHA-256: 25210779981d8fdb479292cdf85284c55b01acdcde5bfe33b89e596b5f4cd6f7
font_01_sfnt_off00015b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B93 19908 bytes
SHA-256: 3a5d7cff760d725f1ab907cf52b371ff41e1ad590ac1d780ebb1070430f2e960
font_02_sfnt_off00018fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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