Malicious PDF — malware analysis report

Static analysis result for SHA-256 61604eb922762187…

MALICIOUS

PDF

70.7 KB Created: 2021-09-15 12:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 90fce02c75e8712951cd15648008ccbe SHA-1: 6dd7b8a0975038935a05d035f85272e185c28dea SHA-256: 61604eb922762187d7b764c5fbc950b870c1fcedb9a52cbb8eeb4f853a17cc32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous external URIs and link farm patterns, suggesting an attempt to redirect users to compromised websites. The presence of embedded URLs and the overall structure point towards a malicious document designed to exploit user trust and lead them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=amazon+prime+video+player+for+android PDF link annotation
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be5264bb4b---28627824921.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/davari.pdfIn PDF document text
    • http://www.larucheapain.fr/ljk/file/gezevalisebu.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/16051500634.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/93366174648.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/cfad65q62bddsj6a9lfil22974/54275710758.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/xixugibomexigara.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/15107573689.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/sujivujenededo.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fce862cc2---nobedoxabepajepale.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090423271214.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/duvikeduzunixubugomopa.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/7444992067.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021090516013781.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/28557216623.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/91618757923.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/a9d6fd06ab119dc459f2aa25fcc153fb/40513309893.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/159fa40a0239ed110c1758bd5a8a5b32/dirideselipureviso.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/dupufame.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/xasodateni.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/vutikiban.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_off0000b305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB305 16432 bytes
SHA-256: 94f8085648560e1eec0e982e457cea94aa41743f7d09065df91f227b607b90cd
font_01_sfnt_off0000dd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4A 10612 bytes
SHA-256: 7a52dd708d51ec97235b83c3ad70e2d49d2fbe324295b3809b425e5683b84136
font_02_sfnt_off0000f589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF589 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1