Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e77df0c50c86791…

MALICIOUS

PDF

136.3 KB Created: 2021-09-18 10:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 134bea47068ba32114425549edd3d891 SHA-1: f0dd3431e856111a41018cf4e2fd85dc99c1e879 SHA-256: 6e77df0c50c867915db939a307585f572f9282ad21d7a8d95b9e851b818fb0b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://pistant.ru/uplcv?utm_term=adele+song+lyrics+when+we+were+young PDF link annotation
    • http://chaukitchen.com/uploads/files/37400501916.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/bomipulexor.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/26251485702.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/d8e4ca1e59477e1be67173c70f81794c/62463890490.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e24a3b45ed---nekitebugikifi.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/40409313694.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/3855166030.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b934464830---64547767596.pdfIn PDF document text
    • http://bulmarconsult.com/files/vipevojotokujo.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/76605869192.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/681891838.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/98974467942.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/36266802307.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/17124608692.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/161397f244c23c---94949859421.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/ximinuze.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b531fb4534---tomukifa.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/mereminegiwokiwimowen.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/41188640091.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/br3l8qim1rpg49k50n7vcq87co/96035876609.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/49947187014.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/56829667822.pdfIn PDF document text
    • http://harlit.com/upfiles/file/39555352754In 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_off0001a860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A860 22480 bytes
SHA-256: 365e118bbb756b81de4ab2ce1ebd883da906083ea93d9f3413bfa71f75389a89
font_01_sfnt_off0001e2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E2A3 10668 bytes
SHA-256: 6422129b937849264abb89e9a8f3a5bee9bbd9437badaa158bb7b88574509f0c
font_02_sfnt_off0001fade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FADE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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