Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc232ecc59bfcd14…

MALICIOUS

PDF

82.6 KB Created: 2021-09-03 05:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 96b14d1e59fda7c7d5b5fbaa2d4a0af7 SHA-1: 5c47caf27ae4029efe70153649915f0ae4af13e2 SHA-256: fc232ecc59bfcd147e98bb5088a41e3fb8611d7c3fac5abb0af945495beb24de
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. The presence of numerous links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the true destination and potentially improve search engine ranking for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/dearm798m625e5mdfcugiv7p54/riketawod.pdf
    • https://geneolock.com/locktactyuma/userfiles/file/74902004712.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/hlk8i3gtmf6t97ug141u03jhd1/87227230510.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/46t83qkl5hltlvdca1e0qs3fmu/zowixipijewe.pdf
    • https://ladulceseguros.ar/noticias/fckeditor/file/31921476459.pdf
    • http://steakclubhn.com/campannas/file/60479929521.pdf
    • http://accessiblevehicleservices.com/userfiles/file/bivam.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a55997c9dad---kegigoxikonevobo.pdf
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/rowubugumivizigivik.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/k16ctv8g3vib08pij0j0lebff0/xidezodi.pdf
    • http://nuitsdartistes.eu/images/file/47498642681.pdf
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/nqnh03aepcbc6m41v4bn88ldou/davolizefojikeja.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/1cc95h4cdu8uvjp51eq6g63fj1/88843038200.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/19203413a6210c42412bfc5ad4a16e1c/noxetoxipuxigibuditage.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3334b3e3c6---26738357076.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9c46a2578---luteravede.pdf
    • http://scouttautomotive.com/editor_uploads/system/files/2268715877.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160821bf65da9e---54564210219.pdf
    • http://dailymaydemtien.com/userfiles/files/diximikizuxozesikuxevajas.pdf
    • http://conblocmanado.com/pics/file/26076404558.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/j3dqbmgel6sdqi9j4ouhuc79t6/gidazagofovupos.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610bae767f399---6147965506.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=free+download+pdf+software+for+windows
    • 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_off0000e09b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE09B 16792 bytes
font_01_sfnt_off0000f8ad.bin
cf7f7a8c8459ee6234fe7922218378e26524bf83c6be604d4296c91048d3379d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AD 17088 bytes
font_02_sfnt_off0001245f.bin
2bdd64caec55b24d5bda5875477274d6aa16d14508cfb1f62418313b534d70f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1245F 10556 bytes