Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a79b612fa9ecc06…

MALICIOUS

PDF

179.0 KB Created: 2021-08-18 14:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bacdc771a9b280c72a5fb073fc33a00b SHA-1: dbe38eb3a5549439071e629a36d27343992c72bc SHA-256: 2a79b612fa9ecc0627cc9ee6302842f2d5e9612b0910d2f89d215d895906484b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to various websites, many of which appear to be hosted on compromised WordPress installations or disposable domains. This behavior is indicative of a link farm designed to manipulate search engine rankings or to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://queure.ru/uplcv?utm_term=is+iobit+driver+booster+safe+reddit PDF link annotation
    • http://nbpcpentecostalchurch.com/clients/65183/File/vubojesekilenijux.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16073879919b4c---rejububokuwukife.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/likuxisolujegajagoj.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/c2cd0e1ea5667f011d63550abbaf0b8a/notipetevodixapapiludizox.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bffed81a24a---kutidazodazasa.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/75598073711.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/tixutirusifototidi.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/8u73hp47nf4mt3rk004mdd7f7l/2616455552.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/titozosada.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d80b7d46c6---ruferelibodomarodogirili.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/cea84412663483f0a86e55c6e6241d8b/32615305748.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/ed937637c9c2dc0b16aa26b258d653cd/94364410336.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/lekenamov.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/0a265777953ddf7b7c7b68620a02df91/67968220006.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfdaebd824---21397303996.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/56384831711.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/ulrh19eqr48i1ca2sn6p48dt2p/jenij.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/tojezede.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/gipifetirilenafitavapa.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc06456ea1---xibiwalijewikax.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/sajotenilono.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_off00025d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25D58 10356 bytes
SHA-256: 4e51cb52db096f426da9d8ada17ec5716447de06fecc816bcd27240fdeb97050
font_01_sfnt_off000274e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x274E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00028cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28CFB 18336 bytes
SHA-256: 7ba38a8fcadfe14035a6cb402e5a13adbfb625f67288ad501b97c8a605ddc94f

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