Malicious PDF — malware analysis report

Static analysis result for SHA-256 091e11f6d2bd7723…

MALICIOUS

PDF

79.0 KB Created: 2021-06-28 14:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f4308a353c462987c5997a7146762843 SHA-1: aa92eb6f131bea71fd1fbfec3d411cb168303a79 SHA-256: 091e11f6d2bd77236badc7b92a58980aa194fc39272af7b8ea0f23e650a2c5ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting domains, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farms indicates a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://chcial.ru/uplcv?utm_term=diagramming+compound+subjects PDF link annotation
    • http://fitviewer.biz/files/file/pamivigodo.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/73618904126.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/1f5a0ae1671b192358b6096a8347ed83/10650969384.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/64on7ifqpoljrrmg928ndpl134/90031515218.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/94443027157.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607228d764b76---57394167898.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/93806525598.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/78878095855.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609605a0b2b48---zozodiridozipaxerowetudaw.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccb7b37d1c---364588770.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/90217859c7efad33e20bc381c80f1d1f/tezoxagib.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608937a8ce168---wogub.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/51985697249.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/94120302292.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609eca7607130---kiruxujexorefokefasiku.pdfIn PDF document text
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/61950301808.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/gr7oig5o131r13k3rmlr12otmh/26291275959.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097a382a9870---zabupufalizulogukezodujun.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/f46118ec071b7a979e3f2231c484d88e/dotofunujirabo.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/17d72f850a34face685d4232d889ea29/61612246499.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099b11562736---8967102621.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ed6f8d28e---zijanedoli.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/67090044780.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/3529068256.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#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_off0000d54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54A 17032 bytes
SHA-256: d739940660402741e6108f7402b6aba8e2c609869a4e0ad14e1888cc0de31968
font_01_sfnt_off000101ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CE 11180 bytes
SHA-256: 93bd458109b81ba755f2ec413973728a365f6163786198da624823eb8510a8fa
font_02_sfnt_off00011b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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