Malicious PDF — malware analysis report

Static analysis result for SHA-256 47ef235e4591f0e2…

MALICIOUS

PDF

67.4 KB Created: 2021-06-08 13:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f6813037b180f117adc0a75a58c54ef SHA-1: 51f3524c3b69f952ad215c5a1f04106c159177fd SHA-256: 47ef235e4591f0e2b2c2bbd617c6fbd6e9f96a9463e626cd73f7096c1f8c37dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=motivation+letter+template+for+university
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/5so17c20ogfmpnkuh3nn8fov0d/bigixevofikumezarabesetaf.pdf
    • http://bpsstudio.hu/uploads/19261368278.pdf
    • https://alshaabcoop.com/userfiles/file/22890159786.pdf
    • https://bustotoronto.com/userfiles/file/97130821883.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e64db449ad---56830682327.pdf
    • http://matstravel.ru/userfiles/file/29314955829.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/gavl7jbkbe9nusun63q879uqon/pojezafosituk.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/5jkqb0ogmmk4a66uqloulvtpb5/gowuxufipis.pdf
    • http://dui-antidote.com/images/userfiles/file/mogipexanuravexezogiti.pdf
    • http://robalton.es/Albums/images/file/%5C/powunizixira.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/36306b0ccba0f0b488d0b878a1c07661/3989267190.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071751dcf1d3---34230115393.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905c6861379---zakukoxekutalowukixepepo.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc1aa8684a---wupizulugunabifakojewagun.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/f20a80023ffebdaa41d21e7c19acaf25/50498307491.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/d62e28bc707730ec2d7ed5dea743176f/povatasofidemip.pdf
    • http://appletechsolutions.com/userfiles/file/dijiraxutanagunevoxum.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805c129c3b1---46424875247.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc83.bin
e339e27d3388bd02c5d4e6312667ebe5a2207fab485077f0ac9f1027e2d4bb39		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC83 5212 bytes
font_01_sfnt_off0000de41.bin
a65c2072f0dbddf7693d7dcf515297b6e4a0f7eae24c1c11a6cdcbb2b1f3ea70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE41 9972 bytes

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