Malicious PDF — malware analysis report

Static analysis result for SHA-256 c09f1ea9cc821e88…

MALICIOUS

PDF

96.3 KB Created: 2021-07-07 12:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5189165556161f68c1664f540bd7cc71 SHA-1: e1d93d537c0cd94ecca5acadb0ce7a5d2443df86 SHA-256: c09f1ea9cc821e88f5feb006b361e5fdd0b31f61af2d120547264a6b9d061c42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a malicious PDF detected by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites, likely intended to host further malicious content or phishing pages. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, suggesting an attempt to distribute malicious payloads or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • 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.
  • 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://prana.video/wp-content/plugins/super-forms/uploads/php/files/mnp6tpntcnpbnat6kg04ou7ivb/jiriwifopiladikopeg.pdf In PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e3bf120910856a3b5e2b18f9ed624273/wumulijakixetekew.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/fiwufeseravajijovaposas.pdfIn PDF document text
    • http://dakmet.pl/upload/3933565108.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9csfcj4a7lqlgdoc0ahkluadd1/rufewenabineb.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/87510031206.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/b03bb5562f64ba855dffcbf764019988/5099075852.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/domupiguta.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/71108625599.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/95065528520.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/43577394909.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ab199318bfb---golodobugejubufiweja.pdfIn PDF document text
    • http://sushi-belovo.ru/files/77892677062.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c10c0c46a46---13587862978.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160784aca9d1d1---bulanizofuzexesoz.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/sfm1flj65kuk96p3g84jvj18ed/35960829934.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c2933ca57---58755353845.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/91683693592.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/pemavuredole.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/nobimarujutivux.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//78737457504.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160710d3905fe4---mujekegewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=council+of+wyrms+pdfPDF 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_off00011401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11401 10720 bytes
SHA-256: d8a98562618ea68a5d934ca0da90966f959f1690c7d44fe4989f65fc6c6b9077
font_01_sfnt_off00012cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144BD 17968 bytes
SHA-256: 03886c63479d9aba1b49ac363bc55984a5c74afca82b9ad3156f9be8021b35a2

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