Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6d04fc1baae3be7…

MALICIOUS

PDF

77.7 KB Created: 2021-05-01 00:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15bc65fcc6cf35f8a4f3633b93fdd9fe SHA-1: 37507eccc989103ebd9165b0c6d5c498c3ec6992 SHA-256: e6d04fc1baae3be73675dac67b42c8c72a3e78f80108b881706d2ff7678e7b26
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised websites, likely intended to lure users into downloading further malicious content or visiting phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, and the structure suggests it's designed to evade simple analysis by distributing links across many domains.

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://aimhc.com/userfiles/file/valaxepopemobozabiv.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a700a42351---17369864363.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/316b93e874f4c534c645898b316b1600/fexogad.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726a1b76ebd---tevowawirosadatokitew.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/b0hc4vh2ivj67rj3mcq195p1p7/31029144445.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/dc33ead933721bb72f5035edda69b53d/7741813531.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/a0c0e93083c93e1777c464614f131767/vurakirimux.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d6732a33b---nevovijaxojaf.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f46b78f8d7---manuravixefenibekorede.pdf
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/47a1122433d9180d06d16441f12eeb02/41695645928.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/367de54b006a871b0b51a096a341ee5b/rowibefuxivuzuri.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6a7f5fbbc26b6807c051d95f9c442515/pepigokilemonezarovala.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/bb4b32373b66e4584113bd0d9da5f5cd/34892839418.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/0ff8caece432aaf823049cf579db8249/zuxerubujotunifubawogewu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=tu+aashiqui+dj+song
    • 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_off0000f2ea.bin
8f116c666abcfd1915e67afb6f81d2851399a3c243a0bea59cae52ad24aaabe4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EA 5108 bytes
font_01_sfnt_off00010447.bin
88db12b89cadb2f191d018a313f768e306328784a22c030001d9ae3cc1cbbf0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10447 11184 bytes

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