Malicious PDF — malware analysis report

Static analysis result for SHA-256 d81bfa67e337d430…

MALICIOUS

PDF

85.7 KB Created: 2021-06-30 11:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cdb21a9c84a7e62be80f6d95b6a96ed7 SHA-1: 27a8ac06f91c7d5c1537069e3e038aa842e0989b SHA-256: d81bfa67e337d430a5d27dba42a64551d1c811dc974096136935f3f914080e44
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The presence of multiple distinct hosts and a link farm pattern indicates a deliberate effort to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://catamma.ru/uplcv?utm_term=jury+duty+exemption+letter+from+employer
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2542990dd---53179756316.pdf
    • http://diversecityuk.com/userfiles/file/bukosewejavawupokabega.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0caceeb95---wowapafutuw.pdf
    • https://rivaflo-south.in/userfiles/files/84035913834.pdf
    • https://vydavatelstvoklett.sk/userfiles/file/57316305096.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a52c4b9c0---23685401372.pdf
    • https://angelsstaff.com/uploads/file/pezotijaxikanaxiwore.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e1acd66f8---8333169500.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/4vuljr178n86t3gjr5aqu2iei0/23959970183.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c52434cb48e---84469781075.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8aa95a75a6---wikijomagatomodi.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/c02abc745271658e443b3a9a10f42947/jagubepub.pdf
    • https://laatjehuisweerstralen.nl/upload/file/zedavujizizisadujav.pdf
    • http://gymostrov.org/gymostrov/userfiles/file/81524039987.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/gq5aeot7ed0uoi2chg92g5ts07/fuviviperowavagilotis.pdf
    • http://chinajessie.com/seadata/data/uploads/img/file/162462101897.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d086ed58b6---74551813049.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/7b7715343764908bff241ab6eb3f6110/64704216407.pdf
    • http://alliance-ltd.com/userfiles/50561263595.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a147e1cb9e---62849380890.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/fc2d3013126b45196502320974cc11c2/79036029422.pdf
    • https://almuhja.net/ckfinder/userfiles/files/46317017304.pdf
    • http://backupcenters.com/userfiles/file/82551334578.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eee27c2764---60166998844.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/053117425c62cea2bfcbd2e089aaa11d/xulibajufarepejule.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_off0000ed1d.bin
6156e5324f9e7074611823570d6d65e862f9f62f1d7a3ae43a6abcb9b4ac588b
pdf-font-stream PDF embedded font (sfnt) at offset 0xED1D 16772 bytes
font_01_sfnt_off000118b2.bin
263c9ab7fef18678166634c667699aea904568ad42da15f380e2e1a62ea40d6f
pdf-font-stream PDF embedded font (sfnt) at offset 0x118B2 10636 bytes
font_02_sfnt_off00013105.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13105 16792 bytes