Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fda5cd52298a53a…

MALICIOUS

PDF

84.3 KB Created: 2021-06-28 12:37:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3313a3fd444e02695b4c87c104b4ff77 SHA-1: 694b67657bc5cec9ca1caf43e22b21b2bd14f7f9 SHA-256: 8fda5cd52298a53a07c8ca7351e926671f56adad644a39d32f48f6bfc95be1f1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. The document's structure and URL patterns align with techniques used to lure victims into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://beerskiboot.com/img/upload/file/9540036746.pdf In PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/66932509589.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075611854d4b---44971961749.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8aff2144fc---wotudosuwotesixowela.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/4785962078.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/e1240aa493a12455b814f2af896e0685/tovixi.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/bigoxumunafifut.pdfIn PDF document text
    • http://ciskmv.com/css/file/barogafidusumewilime.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160827241c150e---77127240399.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/052027418985.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/lgp48g7gmkie67v6f76fral8ja/3755680785.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947cba5c6bc---36530447489.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a09fea2352e---42369550859.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202106091943570857.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/a1jmdi293hkm1rcdp4690ovaco/javoguj.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/40bb3b6608318379f06914646ea10ffc/mepafirubusiti.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/sumumopegutikumowu.pdfIn PDF document text
    • https://inncredel.com/uploads/nepotupobetaxo.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/98095121014.pdfIn PDF document text
    • http://hoacanh.net/luutru/files/79789818281.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/zanezabivuduko.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/3hiorbbo43npjuioph39m4a4po/bodumeligibubiz.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098306810f2f---butijesejijamiliwerogular.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/uq190fah94ud4ecr49km5aqksm/59193814338.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=commas+with+conjunctionsPDF 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_off0000e7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B0 10564 bytes
SHA-256: e711dbd975669e491f994e4913d21986014693c90c552ef5af286765384de45e
font_01_sfnt_off0000ffb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C2 17092 bytes
SHA-256: af210ea580d7d6527ff7d3ee7e4c8482f0fa8ec52fc77ab0fd6a0d81b28e8dac