Malicious PDF — malware analysis report

Static analysis result for SHA-256 29f6a77f303c6b4c…

MALICIOUS

PDF

93.5 KB Created: 2021-06-27 06:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d58635d554198506a966505790aa6029 SHA-1: 246708878a3737e2eb00ad7f33c4c35b0bd73178 SHA-256: 29f6a77f303c6b4c9cde31de357bb70f8b25bcd2ed864a8cdf70fd2a77ee01c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious link farm designed to lure users to malicious sites.

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://gea99.com/ckfinder/userfiles/files/galaxuzagireluj.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a58a5f0c9---foretujizomovaxuzawitek.pdf
    • http://sansboundaries.com/clients/f/fd/fde0d4b6b324343791c5f0705b221951/File/93849185578.pdf
    • https://pubs-icfas.org/icfas_new/dev/ckfinder/userfiles/files/guboku.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/983c34c074e9e71f0f6a343460fb66c8/fogamutokamejate.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06a37bcd3f---puwutilixenepi.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/59l8bbp8sdsa28fc1o8ova10dt/dovarimusul.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc809a06c6e---42501929352.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7713a989ea---linipadenomakovebakab.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073fcce90374---4151495027.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608515ee8c441---65373792204.pdf
    • http://dichvugiayphep.biz/upload/ck/files/nujiz.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/8462c66f8e78a169fa2e776e7f774f9f/pogavakovebogub.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef79a1acc8---lofozofimebadonebufoxe.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f63b910e9---38318266370.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb59de1dae---feratenubilonik.pdf
    • http://tcurryproperties.com/konadnew/userfiles/file/lisok.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/8466ffaa8c5391af51e64b9fe511f1c4/gotale.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609538d9b8d73---87873866263.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/aivbhjme0mjlng54mmpbe8vhn1/videp.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/63e3806159c220b67002ca91963954d3/zonuforimisurogula.pdf
    • http://zpb-maciejewski.pl/upload/fck/file/45424348876.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16082642fe2336---6934522038.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bcdb8a4ef---sodanuwebutufowo.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/304f6117211414162349e28f3f70ace1/30123836112.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=periodic+table+fill+in+worksheet
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001080a.bin
2d546e1f6965d3f6403d7afd87f0a0490d9041ed8ae0a35b0c6794c938b4df24
pdf-font-stream PDF embedded font (sfnt) at offset 0x1080A 17656 bytes
font_01_sfnt_off000135c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x135C5 16792 bytes
font_02_sfnt_off00014ddc.bin
fafd722404b47d87150b17c540e5636b6c88d914ae7bb57a968d67ef96724128
pdf-font-stream PDF embedded font (sfnt) at offset 0x14DDC 10892 bytes