Malicious PDF — malware analysis report

Static analysis result for SHA-256 c47eb888afcc0d13…

MALICIOUS

PDF

69.7 KB Created: 2021-10-03 11:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 813b337d8b4a9da0b6648b734ea60811 SHA-1: 2852cc88d9f5da73a2bafff95bc3ac2e1c853893 SHA-256: c47eb888afcc0d13fe3b6267ffebf28402bf973aa316a8e79a1c333207252f5b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple external websites, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=front+page+for+university+assignment PDF link annotation
    • https://cedd.saglik-network.org/uploads/file/59992749262.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/40208735934.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/sugivasiliderotijoje.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/kovorokizarup.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/wijizusovusukowajobenafo.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16134bca7ae87c---47697785941.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/zexururufekelujudovuka.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/23487533847.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/vonovav.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/zepevu.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/57584869517.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/84757801729.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/36295978296.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/ec8ae1f2cfd8b5bcbb48ed82f0414d46/ruwivesovevekemi.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/jutobobafasesanezutukipe.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/82081768238.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/90927290515.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/26549388908.pdfIn PDF document text
    • https://redac.ch/upload/48872214434.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16149c068bfb45---91855500693.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/gigonarid.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_off0000ad9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B3 10912 bytes
SHA-256: 0534c7c68bfb77b1426c07687d6053f92b73892310d67900db812a745b7049e9
font_02_sfnt_off0000df03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF03 16724 bytes
SHA-256: 075e966b93636f3f0539492ee96e9a58b413f27db5c57ee96a6f8dd45913f1e1