Malicious PDF — malware analysis report

Static analysis result for SHA-256 726c85e2f0105726…

MALICIOUS

PDF

84.8 KB Created: 2021-09-07 05:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ec75f33270ef11e3ec224f24f989dbe7 SHA-1: a647fe70684ed4c17846b0ad757277e126f507ed SHA-256: 726c85e2f0105726374c31911a5c7069e9e3bd08e7d0f8519e3ff1c66c307d79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing or malware distribution lure, as indicated by numerous embedded URLs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are commonly used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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://drafthe.ru/uplcv?utm_term=explanatory+paragraph+examples+pdf PDF link annotation
    • https://fwullong.com/upfiles/editor/files/6990754867.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/polobigux.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/f93d4bc8e6f9b5244d819a273a2f209f/supugagupituniw.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160841ec5c67a5---93446300208.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/1j075b0lsu9bdmusuo1dgnuj43/juvux.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1625436355dosirinemexidosat.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/derafu.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/nenovi.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/pejanipuneriromabav.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdbc12af6ba---61929017852.pdfIn PDF document text
    • https://alutat.com/data/file/jurajemabavo.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/c6ed4f701b7574e5584ade7ec26a9aaa/71621331729.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/68255572416.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/3ee3612c50d16abb752e6dc518f7b828/73383788016.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/zosemuropuzamovoxat.pdfIn PDF document text
    • http://iworking.vn/uploads/files/kevixosadojuvi.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/ec4e365cb1822523818be477d1e62615/lelitemobusidufekareto.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/turuwipajijajutino.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/63717870224.pdfIn PDF document text
    • http://medi-sen.com/files/files/nuwukudupe.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/77848952214.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/nibuwajitegapowonatam.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/95106402006.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/20612196856.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/70d1539fc6af0ec8131185f8cca57e9d/47807972.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/gagol.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608538787273c---23230554454.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://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_off0000ea98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA98 17616 bytes
SHA-256: d6a50d670f51bbb23fdba81ce64d73794c96ac2d33b69a6ed1f554405ba3be58
font_01_sfnt_off000116cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE2 11052 bytes
SHA-256: 676b017a9411f6a4e44739c1478e31320367cabc7bfecf5668c4e8a9f34df7cf

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