Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fc5632ca7a9e605…

MALICIOUS

PDF

69.8 KB Created: 2021-05-23 22:41:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1dd7432ef8b1cd0b0f4ab88742f9cb1b SHA-1: 53e103c90e8c3d53acdcb7c3a2a8a7fbcbdc49ee SHA-256: 9fc5632ca7a9e605d30c05740ca7402f62ff0a9293a1c9688fb02a0f57c4e5bb
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised websites hosting other PDF files. This behavior is indicative of a link farm used to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

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://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/3ac3a4d22942de5773547ed290648463/mafaboj.pdf
    • https://binarbaidfabrication.com/public_html/userfiles/file/virateso.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/9cdde57781a346143e58b047b1332c28/87414018263.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/0938e33b633d2d2a313a1fbed6bc8247/lusosefiruwitiwulig.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba2c5474ed---jadogojubudowemawip.pdf
    • https://ludifrance.fr/userfiles/file/42370390403.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c89b35311d---laner.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609682ce3d429---torajaporiwusavufo.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/fb411a04a41f8690609ad73b0d0fd5a6/jeturufor.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4389447b31---furoxora.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ecf162446---67796675331.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087429508abe---88261825856.pdf
    • http://funperm.ru/content/file/80177309506.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160790bfb3df61---41922426455.pdf
    • http://adabaskimerkezi.com/upload/file/21806424401.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=%25C3%25A7engel+bulmaca+oyunlar%25C4%25B1
    • 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_off0000d2c2.bin
da4d3b6f14ad3f15f391e2fd7dbc00025fbdc2291b3da7c5b0efc491dd3210e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C2 5308 bytes
font_01_sfnt_off0000e477.bin
e8e16e2e6cbae1dfde234be219364b4d75195bd70daa3602af048dafe0aaa31c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE477 11692 bytes

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