Malicious PDF — malware analysis report

Static analysis result for SHA-256 36bf84d74abc4a45…

MALICIOUS

PDF

87.9 KB Created: 2021-09-01 20:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c9a5076f0f9ebbf951f75caf2f9bae6a SHA-1: 682b20d99aef22c9351fb08a288cdcf5b792dcaa SHA-256: 36bf84d74abc4a45724bf50465a21d5c9fd886c517a6fa6a420314f53916b40d
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://nomylo.ru/uplcv?utm_term=movies123+the+office PDF link annotation
    • http://pathtojanna.com/userfiles/files/towedodadapurewute.pdfIn PDF document text
    • http://jp-cable.com/d/files/89907088334.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/3340992253.pdfIn PDF document text
    • http://philcoastal.net/ckfinder/userfiles/files/71428224475.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/mukunigelabavifa.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/71282072856.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/47143510936.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082b7915a3db---83333459828.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/wuwojamipokepewuvitux.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/lakip.pdfIn PDF document text
    • http://painttechvina.com/webroot/img/files/rujikumafovopixutiloz.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/dumikepawido.pdfIn PDF document text
    • http://storemisr.com/uploads/files/jizanupe.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbdad47912---mufavazolupuvolovi.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/10389639211.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/58754393851.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/pimizerabese.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c46eca6cc---90883675585.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/gufumedinexudewufi.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/49588516609.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/kuletijofotiwakabekubol.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/afg27vc78l4qaicclej0lq489d/lukukatu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED65 19744 bytes
SHA-256: 2a1a72d3003e8229ac2ab486d22118561b2520823a9053712cbb99024ee13dcb
font_01_sfnt_off000120f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001390c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1390C 10424 bytes
SHA-256: 092596884b5e122d1d0a334144d9b19022dd75b578824e086b35c370cd9aca78