Malicious PDF — malware analysis report

Static analysis result for SHA-256 a320948a301043d6…

MALICIOUS

PDF

68.2 KB Created: 2021-10-02 09:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9126211fa348d19210b936a41cfab07e SHA-1: 9637ab59ddaf2be310d21ffbfb611563213bd224 SHA-256: a320948a301043d632e85ae98ef2b3d8e11f6582af2e8d1bd3855ebd558ef0bb
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure with an image-based overlay and a click-outward action. It contains numerous links to compromised CMS uploads and disposable hosting, with a high-confidence heuristic pointing to an algorithmically-generated URL hosted on a compromised WordPress site. The document's structure and link farm suggest it is designed to redirect users to malicious content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://huntic.ru/uplcv?utm_term=dog+scabies+contagious+to+humans PDF link annotation
    • http://clubmaniacr.com/campannas/file/koletuzidalebugijab.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/litaropowusin.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109071257524901.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/99cb2bceb7937bd103ae546f1ea59daf/mivetunezibomamesogikeki.pdfIn PDF document text
    • http://hiniceshine.com/upload/kalexefaw.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/videlogolowojip.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/89313808371.pdfIn PDF document text
    • https://marlschuz.com/userfiles/files/50078520961.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/duranos.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/66395298691.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/69332802975.pdfIn PDF document text
    • https://blugarden.eu/file/maludibupezademaluvafema.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/78764625777.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/30494011268.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109291631565905.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/wuketizirabafi.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/63560879209.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/43633123622.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161487293e1499---3856781378.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/40867160246.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/kimezoxoludifilitixivetu.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/i2r06cc5kdn4de9mq0sfqjpri6/gerurixogitukiv.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/48998238490.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_off0000af98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF98 13976 bytes
SHA-256: 923faa5c3fc5c7f7ec9b26bccbae6f2069b32fffbf6296692b2f2dce040f7955
font_01_sfnt_off0000d249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD249 10772 bytes
SHA-256: 366450504a0edae6ac077baa659f3b7d7ffb995ec471698fabcd088b614c9c7f
font_02_sfnt_off0000eaf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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