Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b7f925a88d90cb…

MALICIOUS

PDF

197.8 KB Created: 2021-06-27 12:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 73616d3c70843a21221697f6955d3bf6 SHA-1: ca7501b99b7401b73d24128000f9bed469bbe23d SHA-256: 81b7f925a88d90cbf184a93833127133de7e849dbeb665a52eaf3d87cd26c93e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it contains a link farm pointing to compromised WordPress upload storage, suggesting it's designed to redirect users to malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a623f3cb1e---80317466212.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/tm0f83612fukmvi9vnhrjnaehu/13831578663.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/f9a952cf862f3a60b9ea6de09ee498b0/59990102059.pdf
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/b87r5dci133f55jp8a22c45ik0/duwefajetoruzopopapa.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab0da2a5a6---bipakuzesomise.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/3cbfc3e7d5312aeaf0ffb7acae6aa695/79511279974.pdf
    • http://antifftech.com/uploadfile/file///2021060815204028.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/5sqmr4bnqt78i4vo14kto9ecl0/zakifeboguxomapapujabadi.pdf
    • https://ceccarbotosani.ro/userfiles/file/79713935482.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/4reounnc2obkruska2hdinjl45/95695096137.pdf
    • https://securityguardsupply.com/php/uploads/file/muxulibaxudavalanedutip.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c8c85faf6---janemivu.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/aab4599be9dc4e73227c141440d2aa08/faranajilepik.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/3a61f623e633cdbcca70b4428bc34286/4912232500.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/60a5dd83300a6f8aa575c378e90f341b/25939935940.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c553ed96f9---82511321356.pdf
    • https://proxus.nl/file/zapasusobarozive.pdf
    • http://www.sport-konyv.hu/userfiles/file/xepazizefidodubug.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/ndfadc08tsdfp4d1u7trlqnf2c/34397000518.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=i+was+anointed+to+preach+the+gospel
    • 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_off00029a31.bin
62f278c94d925fd92088dd78b6c5ed3775fc21e922788b33af703a85906b5651		 pdf-font-stream PDF embedded font (sfnt) at offset 0x29A31 26352 bytes
font_01_sfnt_off0002d71a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2D71A 16792 bytes
font_02_sfnt_off0002ef31.bin
86c1e8b79676507f9f4709ac8892140b498caaa4174b95515bbac459680732ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2EF31 10832 bytes

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