Malicious PDF — malware analysis report

Static analysis result for SHA-256 f775c712856efb5e…

MALICIOUS

PDF

117.1 KB Created: 2021-07-27 20:41:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 61a067ca12e7e11edba995e20be95f97 SHA-1: b7030680c033ad1aabb5b509c7ce6f90b93e0516 SHA-256: f775c712856efb5edecbf969f0796a8e1505fb5288206856f809678020223184
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or manipulate search engine results. While no scripts were explicitly extracted, the PDF structure and embedded links indicate a high likelihood of directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://clairerolo.com/userfiles/file/lamuturada.pdf In PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/9c57b99c8c3fa47dd3e65db799e4f31d/64764107099.pdfIn PDF document text
    • http://fluellensoflandreth.com/clients/b/bf/bfbe38bd58d8cb8bd08b82175287e3b3/File/57820393628.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/vidubigamajafegovuxes.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210703174842011.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/63c9346fffe3b8b92a85e7430a260f89/96555269467.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/dat1995k8t8oaiuc4im9okhtma/xukerokelu.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/26e93342999e9751d939313970d8bc9d/79359466644.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aa61711ac92---25271594217.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/3292eb53057c1ffa434a563db8271b9b/sogukimagerokomuvus.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c948f9eb1c---15760263170.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc203da89c---756037867.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/m0tcnvb4buvdkpsin21t0noed7/dejikawo.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/jubekebogifokejisek.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/6db5fb924a9b05e1c10b731d886ef54f/jivajetigadidukeb.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075b43cb2485---28280916073.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/71ee7tlslpscnjoa1ennscre4s/97650945963.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160760a280b2d6---35272822598.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daceee28558---4384556362.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb6d6c54ab---zamazewuvunazafunenu.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/jerose.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/sibibogakujixelorugitag.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/xisejezokupud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=why+would+someone+have+a+blue+nosePDF 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_off0001675a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1675A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F6C 17344 bytes
SHA-256: 64a0ef58f819eb1ef5996cb176b81036f030b3fe9e65a2c7299511e8e08d129b
font_02_sfnt_off0001acf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACF8 10720 bytes
SHA-256: a53508eb70617bd4ce90b3b59298d0894f521950576240e7b69ef253051bb12f

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