Malicious PDF — malware analysis report

Static analysis result for SHA-256 c165c25cee8bcd46…

MALICIOUS

PDF

95.8 KB Created: 2021-09-18 10:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ab7abba08f5f0054bd8fd4a01fdd6e62 SHA-1: 8f26465ee12da324ed3b56b72614bb45bea0059c SHA-256: c165c25cee8bcd4618155c353f7d54b1385895c718d98cec40f361823957644a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to various PDF files hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The presence of the 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade initial security scans.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://laborke.ru/uplcv?utm_term=assembly+language+pdf+download PDF link annotation
    • https://perkunasstudio.com/uploads/files/202109051257181113.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/vojebefazatepagatago.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/pusaxupoxu.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/biremilisarusi.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/43780625456.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/5037ca92263ddc1772ce891a7c9c8069/95410613724.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/sokem.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/nugute.pdfIn PDF document text
    • https://luminex.pl/upload/file/99226160532.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/webuxozixoxixisezobasa.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/95402098322.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fcc7bdb27---vekewaroje.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a80b2ed49---rapewuv.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/81863918803.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/hqe1njp49tjbuuuav9mj4hplpm/tizilimufesibafapibopor.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/zavawofukuzafase.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/161337acdc08c6---42265446450.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/59313064923.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613260626e6cc---lumurazikugewok.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/q11ft0ldpmuvgh7hcbhveas9jb/15712502769.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/petuvajapobirafawafot.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001103b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103B 18768 bytes
SHA-256: 053e8bcd8d8a62229d3a3e76d4cddb360327a1ff4e4c06e9c1987d3ea0f69c7d
font_01_sfnt_off00014125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14125 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001593c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1593C 10972 bytes
SHA-256: 427a4f40a3dfc263cad3600d0c377177fddf0f698269cb0cb62ddabb63c99df8

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