Malicious PDF — malware analysis report

Static analysis result for SHA-256 8058cb534d544a68…

MALICIOUS

PDF

87.0 KB Created: 2021-08-01 08:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4af8c93dc2050b8ec11af66e98f231ae SHA-1: 7606d4dfe93726248050b90008ed9d478853e7fd SHA-256: 8058cb534d544a688023cceb7770b4ab070888dc6cf12717c29373105965c521
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to compromised websites, specifically utilizing WordPress upload storage and formcraft plugins, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lead users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16098263711994---91194591549.pdf In PDF document text
    • http://www.anjhimayath.com/upload/file/jagesuxanupuwe.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/varimatugejirowixivi.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/6766424138.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/98934719154.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/29383164417.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/1c0842b5ae6908eb8a5715d94081b3d2/dotivifa.pdfIn PDF document text
    • https://serka.com/serka/upload/files/sagupuzederuwu.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf3825718f---sifedido.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/39157385479.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/27873335096.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160de685429d27---kepawegazozafesofev.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef03c49306---gowizujukekivipigopiwa.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/524320871.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/k5f173h05kklcll5d51hsqn0q6/51338719434.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/fakilutitofunoripabifog.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/kewuj.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/47237032388.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/nanosukumabogagiku.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/85262273273.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608122405a2b4---pobinujituva.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/47305090478.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e58fc0a56da---62303647995.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+edit+scanned+pdf+files+online+freePDF 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_off0000efd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD8 17256 bytes
SHA-256: 7220b83a321988d53a0754fff0c2147d4b53e47839178d55dda033b02dad6a03
font_01_sfnt_off00011d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13546 10688 bytes
SHA-256: 1c56f8208a23cd65d5756a6738ea15118ce06fc582f90229265c4f4927f4b37e

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