Malicious PDF — malware analysis report

Static analysis result for SHA-256 caa5a09bdf705e97…

MALICIOUS

PDF

75.1 KB Created: 2021-06-28 09:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 604bf8bff1871c6425842998d929a5ca SHA-1: cbedc32d2973c965de61394ab1dcd4688ae9e909 SHA-256: caa5a09bdf705e97cbcdc3850b228c0d45600b587ad14c733711792643420a23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document's primary purpose is to host links. While no scripts were explicitly extracted, the nature of PDF exploits often involves embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7qt0q4drjc0o2s6iq6j7s68td3/vazaw.pdf
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/87977790283.pdf
    • http://zoncmswebsitebeheer.nl/files/editor/file/kexuditab.pdf
    • http://edwardlankin.com/clients/86087/File/dekowozupififitonare.pdf
    • http://quatang3t.com/upload/files/fijafitoriwaziwoxa.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/73vf70r51ccra14bie3unresfs/88214466043.pdf
    • http://parbatsamajjapan.com/img/files/files/kopevuketot.pdf
    • http://pcserviszlin.cz/ckfinder/userfiles/files/zorubugoxilalar.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/2e8tt985ucuo51pihp4cpfhk4v/faniruxifabasudezatorol.pdf
    • http://constantemails.com/userfiles/file/162413572437468228599.pdf
    • http://gocreate.termall.pl/upload/fck/file/barakajiweja.pdf
    • http://wphs69.com/clients/1/13/13dd0a1135c99f886ff4006aa3c820ba/File/lovosigowusisuwus.pdf
    • http://voxel-avocats.fr/uploads/file/busopagoruduwonigit.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/d410b9c1ee492f8f20ddbe1a29940aeb/kufasavupopudefusamizenar.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d60294b87---ripugiwugifiv.pdf
    • http://solyaris.pro/admin/ckfinder/userfiles/files/35977726832.pdf
    • http://eastcoastbiker.de/sites/default/files/file/bogivavoxafun.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/tt08id91ekugq1p12t75ph4ll5/5484566040.pdf
    • https://majorsagilekvaros.hu/uploads/file/35741072747.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/eab66f6c9cf28d0eab3c2b99139f0c8a/19663589253.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/a04bd4a4f6034c786a145641aa67d3bb/petubaxujuvorefezutitesid.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089281c44382---64199012411.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=abbreviation+for+intravenous+pyelogram
    • 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_off0000c018.bin
f4802cc86c9978a108c86288b45896887bb682462872c0a9afecf4af3a6c9a25
pdf-font-stream PDF embedded font (sfnt) at offset 0xC018 17368 bytes
font_01_sfnt_off0000ed2a.bin
881eaa301056b66fc50c60d61b26e14fbce08ddbc65abbe35402cda38dd06d50
pdf-font-stream PDF embedded font (sfnt) at offset 0xED2A 11104 bytes
font_02_sfnt_off000106ee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x106EE 16792 bytes