Malicious PDF — malware analysis report

Static analysis result for SHA-256 0803d476bf826c2f…

MALICIOUS

PDF

86.3 KB Created: 2021-06-25 15:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9ed1178c7bf168156e6b264c7406e72d SHA-1: 3477084ab6eb823d2343d560ba3bc3860b23ee64 SHA-256: 0803d476bf826c2fde55c1f5ad72644dba26379a599feb3bdc4935fae645f9ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous embedded URLs that point to compromised websites. These links are likely used to redirect users to phishing pages or download further malicious content, aligning with the characteristics of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://crewmak.ru/uplcv?utm_term=cute+outfits+in+meep+city
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/1k1139eka0k1dqr97n031nf580/77861553150.pdf
    • http://caratow.eu/userfiles/file/20046397730.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093e7f726dd7---87123412001.pdf
    • http://allasclub.com/campannas/file/20320142343.pdf
    • https://aviatroglo.fr/IMG/file/56002474588.pdf
    • https://abofahed.com/userfiles/file/23183915639.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/89ejsgbsrr2ovr1n9oron56qp6/9787002809.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/bg4nfmj7t7tk2ribpspais3qfu/17031761248.pdf
    • http://menafundinfo.com/userfiles/file/34697747276.pdf
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/30512112244.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/5372fb649a292fbfbc8da0a6b64d6e3a/rebasufifojup.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/52f66313f70ab89259b3213877596b04/59488907043.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/49b81e149a0a30cc42ac7b90c293b402/54581528031.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb3406d126---piserafukegusexutelatituj.pdf
    • 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_off0000f363.bin
e470807d209f51a8eefe46b0290d7e6f609979e730eeb7d402398fc36a41a3c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF363 10576 bytes
font_01_sfnt_off00010b9f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9F 16792 bytes
font_02_sfnt_off000123b1.bin
f1042813afb97dca943e8f68a0d85d145b00ff4b23be044af62b43c398510ed0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123B1 15916 bytes

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