Malicious PDF — malware analysis report

Static analysis result for SHA-256 01564cbf393afa3a…

MALICIOUS

PDF

73.6 KB Created: 2021-09-04 12:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8672d41ac9b71cb9895cf94c46588ff4 SHA-1: 4005e4a638f3d56a3452f1676a209868b3f93be7 SHA-256: 01564cbf393afa3aa1ac2298842200c7a2a0edc419c176430e251db4e3babf6f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it's a link farm, with several URIs pointing to external sites, some hosted on potentially compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://inprovit.com/ckfinder/userfiles/files/sefetawim.pdf In PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/llv84mrlpt5g9p9dmlm7bdmro5/bizobiminixi.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/belowawugulijes.pdfIn PDF document text
    • http://thejosephinebryantfamily.com/clients/48776/File/64281207307.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/88343943898.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/jumagasofumi.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/f927209d0f7f722841be68157f51ac67/47098161261.pdfIn PDF document text
    • http://midel.me/userfiles/file/fogirofes.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/logobawuwikobodopajaz.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/55408105197.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/rusegosuwerapojuponojimav.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/46429722319.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f57f91f352---zoxebetivopaso.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743e9b2ada3---5024072176.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/tixeni.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/9550675541.pdfIn PDF document text
    • http://canvangdientu.com/images/file/mexapuxufuremaperar.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/ug5v82rv0mk618e2piqk69omof/xozepivewawesubebi.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/d89b76361e900ec9c9d7a8745c060c43/dokamazepomopuwumagej.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles//imagenes/gilawizifotadofuzafafunuz.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/nirorifisagebozajerinadu.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/73493023522.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9da2ac3c61---75691813928.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/20949677753.pdfPDF link annotation
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=what+wondrous+love+is+this+sheet+music+pdfPDF link annotation
    • 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_off0000bb84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB84 16884 bytes
SHA-256: e41a3187088bdfced4b165312cd6a629f106bfdff9b0d89d20975efa5883e43f
font_01_sfnt_off0000e6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D1 11128 bytes
SHA-256: fae80343b9934b1190b38d9932f0d6c86d5f21122a90972aaf2b6e2b7aa71eb1
font_02_sfnt_off000100ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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