Malicious PDF — malware analysis report

Static analysis result for SHA-256 7667d4416b034f72…

MALICIOUS

PDF

118.2 KB Created: 2021-06-25 14:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f487f45cd4a48ead35283b43a8bad491 SHA-1: ea0da43690eb6a2f3ce9595910efbafb0de81e7a SHA-256: 7667d4416b034f7268ea0e26d642d898b7e7ec5609fa7797c5710ddb525a5463
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV specifically identifying it as a phishing trojan. The document contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a85e0dc6b.pdf
    • https://timjanen.se/anvandarbilder/53/files/40666442390.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3f3af25ed---72613749775.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/cuuq5h0n3qj2t1fme9cc5sjhnk/balumupadotigapizo.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2316bb744---84308273778.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608469c25c402---waxawarizefeviru.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c5dd27141d3---34171724882.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff0e133226---lopabofuvupuzokorak.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a366a1724de---84213801112.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982a8a048e1---juxilegarisuvikafibe.pdf
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/4o4e14bu6167baeu768u6rnacb/kudotilaxepuronunuv.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aed390fb4b---87732576380.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4883a99c1a---40545244679.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9d7c52311---94647374739.pdf
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/bogetuxatef.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/09b3a82d0b9adcec03829c94bdb0327a/batizumodewuvajekef.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=use+of+drafter+in+engineering+drawing
    • 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_off00016e46.bin
42e135cc1071eef5dde148eccae21f79588bfb58a3b5f5365e516691d8801940
pdf-font-stream PDF embedded font (sfnt) at offset 0x16E46 10576 bytes
font_01_sfnt_off00018668.bin
e9f8d6590008ab27137a28167eaf2df0cf497892d904b5274ad4732b9c1d925b
pdf-font-stream PDF embedded font (sfnt) at offset 0x18668 17504 bytes
font_02_sfnt_off0001b428.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B428 16792 bytes