Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a9fcf076c1a3ad…

MALICIOUS

PDF

91.8 KB Created: 2021-07-07 16:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 9af62ee05d95caf67edd34d4937dd276 SHA-1: 1beeaf314c1f7096219f8afba415d28e2c7a3f45 SHA-256: 04a9fcf076c1a3ad1fb2813e3a25dd3ab4af496c9c9b36ce700d09fe06413333
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to host malicious content or phishing pages. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://kovosluzba-praha.cz/res/file/gilejan.pdf In PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecda8590c9---xufitevubog.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/tomaraziwavinux.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a943ef145f---wipobajedovolaraxaza.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/b74dcf3588cf69787aaecbb89c4381c7/kibixam.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/68f1ffc7a18e3161b2d139e061e9f778/jubabedexopabiwixom.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/7610e44ef218003ebcacbd2f9655379c/zegibijap.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/47860095951.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/c920b40a715c16858b32d092ac3cfb0b/58207619525.pdfIn PDF document text
    • http://atallmed.com/userfiles/files/42963994706.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/d5050e6b52e4498363c6b2aacd1b6bab/bunipivefesi.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/c7dd88672a665cf040e43d5b0781e611/jowutaw.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608719f713c92---62272778868.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608367bf6244c---28328462498.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/19412132161.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/be686f9082bcc7e5041521e8511468e7/57033499917.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/436832357.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed9b70d235---80560555667.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/93669332307.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd46fa6f33---mikixewixeraperesumom.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/5d8b7c08621c40695e268004d5771fdc/62985691852.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/61475943744.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/756f2a2de08781197205440d51804eef/27233575993.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/4dbrq276blt9a13o5eur9qn2mg/genexetifaki.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/26377120872.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+do+i+cast+a+movie+from+my+phone+to+my+tvPDF 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_off00010248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10248 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5A 17436 bytes
SHA-256: 4060ab60f7e6f00b5aa36d917732c4726bcb88b225da93c9b3a974f7fbd92dd2
font_02_sfnt_off000147de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147DE 11096 bytes
SHA-256: bfe4c4c2ab4cab38f12f2d247a8c17925314926e08c38d8d3e1eaa2607c5f0d2