Malicious PDF — malware analysis report

Static analysis result for SHA-256 8224993c0f44fc48…

MALICIOUS

PDF

89.6 KB Created: 2021-09-01 14:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 354d6c43b39e3a7e4f494c8680d9157a SHA-1: 55e89c4e83024b4820db048668a9abd667c241e7 SHA-256: 8224993c0f44fc4881990b4d8e9b17edf8df7619bf0a76dd6bcad35a535cac1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple compromised CMS upload locations and disposable hosting, suggesting an attempt to distribute malicious content or engage in SEO poisoning. No scripts were extracted, but the presence of numerous external links indicates a primary function of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/537e606ef922701aeebdf4cda81ebd76/48591691640.pdf In PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d04d6f18c47---zezidizafejowumasozigat.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/nupazixumuvogun.pdfIn PDF document text
    • https://pendekaremas.com/contents//files/48632296557.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/rijebavitalaxanutapinax.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/11143592249.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/sowesuri.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fce3508fa35---sevupuvemaferibaloweti.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/elq7a007j5fu4dco9re7vg6l6d/xekejorirarikok.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad334bffb2---27380122651.pdfIn PDF document text
    • https://incense888.com/uploads//files/202107301601039417.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210529153718_1815714696.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/t3b6hei0qu1jhduj8c4caq5u2j/velonojafumizazodupesewek.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/berevepajejanomag.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/fegulabilowunakarorubut.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/1ef1ed84423b81af655faab7eb08d34b/pirusexikuvuxudawofo.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/bd2b1d595d1bbc26f01c1dd934261ac8/nokorevevolijot.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/25961594662.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/daralabomijesezuzigiwuri.pdfIn PDF document text
    • https://loyd.rs/images/file/90488360551.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=isolation+meaning+in+sciencePDF link annotation
    • https://unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/gomodetususenimupon.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FD 18648 bytes
SHA-256: de5b49e83774f12667e6519a8ac7823b45ab436071b206321ca05f86acaabf1b
font_01_sfnt_off00012a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2B 10424 bytes
SHA-256: 6256590c0574d935d71042d3b73f158c323b96e4afde332be008b70b8ce1a6a4
font_02_sfnt_off000141c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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