Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef1d717a2f0fd57…

MALICIOUS

PDF

73.7 KB Created: 2021-10-09 10:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a136702f4b7d1aa6bfaeba6215c700cb SHA-1: 583211e38810be4b75206b6efa625be2de2b8eb9 SHA-256: 4ef1d717a2f0fd574173c07951b692eeb76b8dbd6cc04c3b84eff0c548b6e98e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains numerous links, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

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 http://ergakiland.ru/files/files/86967494300.pdf In PDF document text
    • http://benevolo.it/userfiles/files/wivorixawalizowekeforeso.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/20438349510.pdfIn PDF document text
    • http://underbutter.cz/download/foto/93212532000.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/73566284546.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/81010475210.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/161482efa1fb9c---22288798219.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/77919798682.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/tibatokiwomuj.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/vizefatotiges.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/wavobo.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/zitusarolubatujibajijerob.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161480bf5e6161---vikuxakalufaza.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/xozawamabisuvesavulakavut.pdfIn PDF document text
    • http://przybyszewski.org/image/file/19547729704.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/pikazuxo.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/61566373439.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/76089165382.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/94703774038.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/pasas.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161408f4d7eb26---dikilunemodololud.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/bb6e30759ef7e8066d2d1b5b9cc480ef/55297703784.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/3bb8bf37454b7b11b615aafea494219b/14850954724.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/84534362274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=morally+justified+meaningPDF 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_off0000bff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF5 15620 bytes
SHA-256: 41711033fd4ad0df9bdf01665142a852fe0e0d7bc1759eec9e137d3a277f13cb
font_01_sfnt_off0000e77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF93 11032 bytes
SHA-256: 73b543609afcd74401603dbf17a9662ba4f74b9fcdc23baa470412d32df5052a

Open this report in the interactive analyzer, or submit your own file for analysis.