Malicious PDF — malware analysis report

Static analysis result for SHA-256 92b67db18bb17788…

MALICIOUS

PDF

70.8 KB Created: 2021-10-03 14:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd623bcd4016afd3b7064de0f02e3fea SHA-1: 1a9bc2bf6e641e5b0255bd60ec620ed008ba73ad SHA-256: 92b67db18bb177882db274d8c506b437e43c07d00314b80f25169f3da9934b95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed for phishing or SEO poisoning. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=spring+boot+architecture+interview+questions
    • http://hainescentreasia.com/images/file/20959797387.pdf
    • http://crisismobile.com/ckfinder/userfiles/files/28576228648.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16152db1f70953---47462971149.pdf
    • http://mextro.de/upload/files/wonikoxujagawarar.pdf
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210924_025837.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/cs4m0p9024cfon8cs8ll6d0ai1/52447833943.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/e3e45f2219637815bb928297af467d63/58683515856.pdf
    • http://imoroz.by/upload/file/zofevufozikapizazivogibo.pdf
    • https://on-call-anatomist.org/ckfinder/userfiles/files/lifuridumuwowe.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16144e388c1863---55459328021.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/abaa2dea76008f76c1fb14f6af72ca8a/80861382720.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3259735cd---46456289392.pdf
    • http://atomleasing.ru/media/File/94479575600.pdf
    • https://olgunbey.com/upload/ckfinder/files/13908262028.pdf
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/sojegumafokigifip.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/161434c58ea429---16036807417.pdf
    • http://tolaniprojects.com/userfiles/file/29605951337.pdf
    • http://gesundezellen.com/neu/userfiles/file/xexemanawezoxowukal.pdf
    • http://12shio5.com/contents/files/suvodad.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/d941d6554735674fab6fe3407b1e6c34/beweputexulavibiwemif.pdf
    • http://2990592.ru/ckfinder/userfiles/files/41459802055.pdf
    • https://shipnhanh247.vn/asset/files/lepasijudenizemom.pdf
    • http://www.pacautomarketing.com/file/maruwukewom.pdf
    • http://eros-arena.name/eros/userfiles/file/tumuturokasomuvemegeki.pdf
    • http://vdavloeren.be/userfiles/files/66314063314.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_off0000b58d.bin
c0e768b6c5622e65c1bcb2f90cc1a0b422c17390eb0c81026a865b2c55d0cecd
pdf-font-stream PDF embedded font (sfnt) at offset 0xB58D 14956 bytes
font_01_sfnt_off0000db57.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB57 16792 bytes
font_02_sfnt_off0000f36e.bin
56a0689ec1a65a73ab3852ffed915c40ac8c4fafa2b96c88dafb8931aee53347
pdf-font-stream PDF embedded font (sfnt) at offset 0xF36E 11220 bytes