Malicious PDF — malware analysis report

Static analysis result for SHA-256 29910eb3ed9646c2…

MALICIOUS

PDF

82.4 KB Created: 2021-09-13 06:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b816c70cc135d918b4c8eec723b3a844 SHA-1: 632091b24b75be0d12a0b2317968fe23a85fb1d9 SHA-256: 29910eb3ed9646c283e6279d048c16e855e43207c71c2102f2269d467deb6d7d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, pointing to multiple external URLs, some hosted on compromised CMS upload storage. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites, likely for phishing or malware delivery.

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://www.scmsgroup.org/ckfinder/userfiles/files/776897639.pdf
    • http://heizler.hu/files/file/tejibuliretelaxusol.pdf
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14058357880.pdf
    • https://cantarefides.ro/admin/userfiles/file/59910427090.pdf
    • https://groupekineconcept.com/userfiles/file/juvibotoluwof.pdf
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/japakekosox.pdf
    • http://saraya-shop.ru/upload/files/kudexulegadi.pdf
    • http://archiw.gbpopatowiec.pl/img/upload/files/vedofus.pdf
    • http://yh-nutri.com/filespath/files/20210908061206.pdf
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/zikawuxuzafozav.pdf
    • https://stillwaiting.org/userfiles/file/77313336487.pdf
    • http://sintjorisparochie.nl/userfiles/file/gozulivezunenejides.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161394f8c19d76---48238239888.pdf
    • http://ck-kutnahora.cz/gais/image/file/fovivijad.pdf
    • http://hanasushi6.com/uploads/files/17569280154.pdf
    • http://mrcubezpieczenia.pl/app/webroot/media/files/53818076194.pdf
    • https://bloomeng.com/uploads/wovezisasavonuw.pdf
    • https://kiptep.ru/file/fenagozejitakejipeku.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/f1e054866fa896ec9ba721416f8ed306/vosixenilexudorojokiku.pdf
    • https://speculatio.in/userfiles/file/tiwaxukusodurubasuvenufaf.pdf
    • http://ampletrekking.com/userfiles/file/99411680549.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfac043c6f---kupegires.pdf
    • http://asztalosweb.hu/userfiles/file/8435482532.pdf
    • http://appli-veolia.net/ckfinder/userfiles/files/95588152482.pdf
    • http://donghozibistore.com/luutru/files/gukumogudoguvuvol.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=watch+iptv+online+free
    • 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_off0000decf.bin
3d5b38f09d99eacdc2ca36ebdd7d03fb9c21a12fbbead5a0c25d1ee193d903b1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDECF 17700 bytes
font_01_sfnt_off00010c5b.bin
cef2d9a7b6d1a53bf03910f9016d28bec60690b1b50451b712030a4ceec8a721
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5B 10468 bytes
font_02_sfnt_off00012420.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12420 16792 bytes