Malicious PDF — malware analysis report

Static analysis result for SHA-256 daf75d374d609e17…

MALICIOUS

PDF

80.5 KB Created: 2021-09-07 04:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1b88bfe0b33662d2b3971dfb9819f4bd SHA-1: 456325e251b4bda1685831f7ced799e395eb7ad4 SHA-256: daf75d374d609e17c2dc26d3245f056ddfdbbe5deca7984a6f8f8168cc67d621
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the nature of the links and the PDF structure suggest it's a lure for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://synerhu.ru/uplcv?utm_term=lg+oled+65+tv+manual PDF link annotation
    • http://www.gc-antey.ru/ckfinder/userfiles/files/kegogejororijo.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8e949165a---841728699.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/85017523975.pdfIn PDF document text
    • http://balone.net/_upload/file///jefop.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/laroremipilejes.pdfIn PDF document text
    • http://atek-ent.com/upload/file/zumomarunefagogudaw.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/46993873985.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/0952034fea5cc3a96da32deaea82ba53/ketawotoposakoxedakiz.pdfIn PDF document text
    • http://ebanksunited.com/clients/7/7d/7da19d52c1086e69e61582739ce98a0f/File/fidedirobidozibowe.pdfIn PDF document text
    • http://jx4d.com/userfiles/file/10094198838.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/7436886903cdcd00a1846e12259bd331/bolibezupof.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/34792515607.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/3307ddf0a95de0c9979b7d6178547f7a/zonumeroxetufulinunisaz.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/razesesezenazozaweruvejo.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d061d4ec4---sawamegitepodebixuko.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/zajopudezetororidig.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606eefded2a88---49465180077.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/74986038726.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/161093232b1d4a---32708649713.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/wadixakekovotixumi.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_off0000d570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD570 17768 bytes
SHA-256: 880f47daa6a136ea21cf7c5392ef47b7a319b2e59ca0cc59757254f418f92998
font_01_sfnt_off00010448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10448 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5F 10656 bytes
SHA-256: 6da08547c1325c6e39305d78ae32fc337076259d708ca18c91fde5d8a639fb44