Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9e02e1a975f33ba…

MALICIOUS

PDF

85.7 KB Created: 2021-06-26 06:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41e0298e0cce0abcfe96b772e4e11b2c SHA-1: e5c7ef75970503bcbbdcd951a5c3b39cc5f625b5 SHA-256: b9e02e1a975f33ba064639144ee87098c21a01ff6c1a6b929fd0c838ff58adba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The presence of embedded URLs and the nature of the heuristics suggest the document's primary purpose is to redirect users to potentially harmful external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/p6sm6pcq750gobpkil5o6jr2r4/16300833576.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/766f91eebfa9ccb88f4a3e5f69594b6e/20067560678.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606da38d60951---25391995914.pdf
    • https://bikeid.net/ckfinder/userfiles/files/makadoj.pdf
    • http://dieta-plus.pl/userfiles/file/muzetubo.pdf
    • https://fotobolfestmeny.hu/mvc/userfiles/file/fuxeratomomulabefomevubow.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607cba07e18ef---71761151154.pdf
    • http://strandedtattoo.net/file/34595539787.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/7e6d4f4b432354588d48bff7453d2e37/16323784093.pdf
    • https://alianzatours.com/imagenes/file/naremozodatojipezute.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e83e63f24b---63455259029.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/9d557035519a893c34c9466112216246/40538383138.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9a6de5b2d---99563507922.pdf
    • http://progfin.pl/userfiles/file/ledodedirudevorevutamix.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/agbb2q55nh8tcc65eocdcpcanb/vulavirixe.pdf
    • http://fonnepal.org/userfiles/file/febidigika.pdf
    • http://laros.cz/UserFiles/file/dorabuwegativanete.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/6lc16bguhqi9b4kpp78chq4occ/56632945380.pdf
    • http://hebammenglueck.de/ckfinder/userfiles/files/41954173108.pdf
    • http://ainut.fi/userfiles/file/66621003567.pdf
    • http://accomplishtheimpossible.com/userfiles_ati/file/puxemimiwusapat.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00606459b4---fuxenuxozekitirufejud.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=another+way+to+say+some
    • 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_off0000ec54.bin
68fadbd8b81739acaec79edc851d7646b53b7c2a2840394026ad91ce45defa6b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC54 17836 bytes
font_01_sfnt_off00011a26.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A26 16792 bytes
font_02_sfnt_off0001323d.bin
2012793c24a8a7740856752d3f61fbe5f3c470b8f34a3a455600dd6c49a21ba8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1323D 10416 bytes