Malicious PDF — malware analysis report

Static analysis result for SHA-256 c928a0b564994c1b…

MALICIOUS

PDF

88.5 KB Created: 2021-07-13 21:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3fff9f4598bb506422e76f5420aed89d SHA-1: 521a483e3093223c3cab309e1270f72895bebe60 SHA-256: c928a0b564994c1b5411a84a53c95d9f453d56946b0a57885d5dccaf19cc74d2
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious content. The file's structure and link farm behavior suggest it is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://tuanayapim.com/rsm/files/zonapatimexoduzemubudig.pdf In PDF document text
    • http://timavoshipsupply.it/userfiles/file/2394137695.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076eff6a4980---mesuxabaxaxinenutoborawa.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/ffbe229b681c04e98ecff71cf4ff5f5d/98491310444.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/moridopefisusokepobikasog.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/o8b0mhij15j4lc18g69ne7grs8/jimakevunomigiwamiwuj.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/6531978251.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/3oc8tbqsm6qn7phlhelc4nj03q/67715835082.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/19751558185.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/2ar1qss7nll7jaunej3mdvj2qu/49123272373.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/8bael5bb3rvbm8imscga34r262/25677919749.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a51a854d13b---dadedenigijawijip.pdfIn PDF document text
    • http://buchtel1967.com/clients/26382/File/fakinixiguzakalil.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ad15a69deb9---retilujabaxogudupibufu.pdfIn PDF document text
    • http://tano-cable.com/d/files/noxagevezorimo.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/duwamab.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/d7fb090e898cef143864ba143162d085/89282150420.pdfIn PDF document text
    • http://lyshiying.com/d/files/fufasesivapotavun.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/27278616814.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d47a4d820---kidexajedafifajokaj.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69047920949.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a79f87b663---89216412380.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607288fbe1ddf---rutozejero.pdfIn PDF document text
    • http://easthighclassof1962.com/clients/2/24/240b89ecbeded73b1ae3fdc7544f4fd7/File/rejuvilojotivojoxasef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=famous+line+of+mulanPDF 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_off0000f7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC1 17336 bytes
SHA-256: f1f8398e186e2b3e9406549fd568663cc6f90f08c164bf25f10354360c983f64
font_02_sfnt_off00013c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5A 10252 bytes
SHA-256: 300f7518410b04df6bae320118a5707a173ce1c6fbc210fe6896d3233bda46c1

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