Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d36b8277c79536…

MALICIOUS

PDF

94.2 KB Created: 2021-07-02 00:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee8fb6f647bc0d1e4ad763cdd904fe96 SHA-1: 1ade3940e1fecebdbf1ad964268065fe0e3583c4 SHA-256: b9d36b8277c79536983d79ef96f301f8c2b01962f0728c1fdfe387ddf72b04ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://chcial.ru/uplcv?utm_term=unscripted+by+mj+demarco+pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/h8pg1ejsrs8gfun79dvbaag79j/91911245923.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c56f9fe8898---23042692360.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/a1d5a8c95bceff8b459659505492a9ce/31078155724.pdf
    • http://protok.pro/upload/files/pisujujepus.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c6cbb797f8a---nanowuf.pdf
    • http://www.hangmandigital.com/files/file/81680236011.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c567b0295---nojukakiwekerik.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d57d868a011---74097836070.pdf
    • http://dolphinkorea.com/files/files/vixeragonuruvuzukoxap.pdf
    • http://kemenyseprosiklos.hu/upload/file/pexolugegojizivosid.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160dacb760c1cc---rijugimas.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948e21baa4c---87446967722.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606d65d85b6a7---75709218902.pdf
    • http://womenwhorockarkansas.com/clients/4/4c/4cfcdabbb7b8ad81bafe9a4295858145/File/43047025083.pdf
    • http://hzqzg.com/d/files/70411538573.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/a89b5bad545a6359dfafd2f8bda1b4df/304603743.pdf
    • http://araonline.hu/uploads/file/36209953977.pdf
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/a3d2c50772cef793f98f28d70181e5e1/kokulotapibezite.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/4a3870c70675571339593f99465b62ec/88362394333.pdf
    • http://castudio.eu/userfiles/files/32649153916.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/a52482be7e0735f19e7a4298333ea1ae/fogogetedazavasovoravi.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/3b89e7f98fbbe90a1592d6fd2fa5a6f0/dopegaruputupumewinulu.pdf
    • http://www.valathors.com/ckfinder/userfiles/files/jegegomivefikewonijiz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001093e.bin
3a035d3753b1f4ab3f46abff7a89350751096760df7929b202712d96a076d314
pdf-font-stream PDF embedded font (sfnt) at offset 0x1093E 17948 bytes
font_01_sfnt_off00013810.bin
2e5f63f6a6b6773b440cda831c3b19ce5dcae8319b86707951316f9a6f5c34e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13810 11124 bytes
font_02_sfnt_off000151cc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x151CC 16792 bytes