Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e918ed96281ffc…

MALICIOUS

PDF

85.9 KB Created: 2021-06-26 21:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8da4ea401748d2a495dd21214a8da345 SHA-1: faa2199503921777b2e0d7096daa8bbb0005cb9e SHA-256: 71e918ed96281ffcc31e6ecf8378c4b6a6365cd5d1da52f02847367f8d299503
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a high likelihood of it being used for phishing or distributing further malware. No scripts were extracted, but the link farm structure is a common tactic for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/487mm6h96he7ji4pg0lgkf6u66/pamobofipa.pdf In PDF document text
    • http://brandnewgoods.net/userfiles/file/bapekogenijovug.pdfIn PDF document text
    • https://33mobility.net/uploads/files/13618232499.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/budunosarawusowekeju.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/202152139552885.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/661f5898e22c0b564097839a494df2fa/63017635754.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/77e1090d73df5d530e205a8721846c05/mogixilutepusudixev.pdfIn PDF document text
    • https://bursac.net/userfiles/file/dumogo.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608c166ca0053---62723629064.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/jevesilasalidibaku.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/3c0078afeb04b94a802c23a05ae92968/88257081367.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ee2604ac8---38441699275.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f52015268---mininelile.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/kemanadepamuru.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c687ea7288---figilitukidukisugavig.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/konajewaveninuzepesi.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074374be5872---17754254765.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/bawumomosatenuvalalov.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a10826f1f---rujivolukudet.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079488c7333a---zinibijalusutedol.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/35127526840.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16080e189975f1---kuwugukovizafodukogipefa.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/ferumirivejusanazepaji.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/4ojh78rce2121js5rclv71o0j3/tepovefibudafi.pdfIn PDF document text
    • https://ghnservizi.com/file/16351244599.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=production+possibilities+frontierPDF 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_off0000ee1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1E 10692 bytes
SHA-256: cb0c433ec77dc5c3a0a9cd57c881972ed818885637c46c4ac85bd1a9339cae6b
font_01_sfnt_off00010684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10684 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E96 16684 bytes
SHA-256: f4610c5e53b595f844c2a1f8bc6f4d85d63befbdd7e43abab9a8e89ad1cd6b09

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