Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58bc01d09ca4923…

MALICIOUS

PDF

92.3 KB Created: 2021-06-28 06:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b11a17b3ffd1132764edf27ed877fbc SHA-1: c35d112484935ff77cbe9ef3951f5ff0b70531e8 SHA-256: c58bc01d09ca49237b4060a45f0d044414a424b8c88d879751e1fe23a58b2108
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URLs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=silent+h+at+the+beginning+of+words
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607aff540f144---43358571667.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/051f2bd6029a7998b836b5af72994b9e/30478530866.pdf
    • http://emotionpicturesfestival.gr/userfiles/file/58589469182.pdf
    • https://afayl.com/userfiles/file/bizinemewasokuvusefesagu.pdf
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/19417507533.pdf
    • http://mtecommerce.it/public/news/file/63072779848.pdf
    • http://www.halpellet.hu/userfiles/files/31294975843.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2b1d15c6b---52102410969.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/ea0788ec6ee06bdead53ddf8a8c3da18/dawonesajiwotavabopedifo.pdf
    • https://promise-land.com/upload/file/kexejeduxomumuxuja.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/3f7723157a4e43f0fd19f8cba89fd3ed/97899335126.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bba83c07c---91021493865.pdf
    • http://allnatureint.com/userfiles/file/gefarivuvarawomebadozu.pdf
    • http://criollo-cocoa.com/userfiles/file/wukefesatipesozinipubuma.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080213096115---wijurope.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/6eiicbpk8n64qtq37od2cp49d7/81797106570.pdf
    • http://obasekiestates.com/UserFiles/file/vodusikegerukofaze.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e62ea35031---tonetekimuxodidab.pdf
    • https://htchninc.com/d/files/79338378108.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609818c77f3e5---69111340474.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca2fe7f412---duragasejudixuk.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9f4.bin
a1059b52b69f286f9e44aed9483fb3daf2e559d57c7402f213e6c1fe9fdfa75f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F4 10936 bytes
font_01_sfnt_off0001030a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1030A 16792 bytes
font_02_sfnt_off00011b1c.bin
e5338578b622248d883cb9d4837a23e1f353b7ded1264bd20d0c01eb852afb2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1C 19608 bytes
font_03_sfnt_off00014e99.bin
b1ef7b52ed35dfd01120c19ee4193d967dc828f2fc549fe1a2d8c3c5029b4647
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E99 16244 bytes