Malicious PDF — malware analysis report

Static analysis result for SHA-256 f42acdcaee3a6ee2…

MALICIOUS

PDF

82.9 KB Created: 2021-09-07 09:18:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 70dd8f642cbe47266232eea51c4322fa SHA-1: b2a576c34019d0dafecaa9c6b1d048b938bf5120 SHA-256: f42acdcaee3a6ee2474d1476e0935e8655588a7341006aa0b8f851d4a9c8e1a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL analysis suggest a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://sonntag-immobilien.lu/userfiles/files/zovaduk.pdf In PDF document text
    • http://thermogroup.ru/uploads/files/megugipipoperifomemazejoj.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c167cab967---gegitinedusivalogibovibe.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/goxifawetofa.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/jitenovapejolunaxupesa.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/nevikalinumitojag.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/vezubexisigeduxoziva.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/kedefidatalexib.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/kugesajuvumiduvopotuxi.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cd9f3a1a8---39974718082.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16097abf05c285---dipovuwuguv.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/zusofi.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/biturunokozulitawugenujur.pdfIn PDF document text
    • https://horticulturenepal.org/userfiles/file/vanidajiminijofosizesa.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/20122815043.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/naxumamomedabumiso.pdfIn PDF document text
    • http://health-bridge.in/upload/file/76238508243.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/27527732844.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/vebiwuxedep.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/4830b468bee6e2980e1681de0a409965/51319807145.pdfIn PDF document text
    • https://masihpt1.com/contents//files/14943152234.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=spondyloarthrosis+lumbalis+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_off0000dc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC42 19116 bytes
SHA-256: fcfe8809b876e2b65764655ec4e741512026614e8aa40ee72da7fd0b42c9368a
font_01_sfnt_off00010d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D25 11060 bytes
SHA-256: 58ebebd5833476f88dcea675b6dda8b531d73241dd25f246b6ac91777bb124dd
font_02_sfnt_off0001267b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1