Malicious PDF — malware analysis report

Static analysis result for SHA-256 312a73772a607ed2…

MALICIOUS

PDF

67.9 KB Created: 2021-09-03 23:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0cc8a664848dd47b71cd2a75566513da SHA-1: a39515085f5280166aad08bfa33f13234c3b9499 SHA-256: 312a73772a607ed2afbc79f90549f517f74b24d5e412d84c73caa7cc84cd0317
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9253

Heuristics 5

  • 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
  • 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://sahrugs.com/userfiles/file/vesegopukunibe.pdf In PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/4c4576869466042a39807e16285ffa38/ravapagefugexo.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2119d5ebad---sanupubuxaje.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/80m2aac5e8o5c5nr6b78j7n7na/5218383760.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da100640d4---68672847045.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0adb37871b---29945638648.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c912d554f1b---zejezoxaturilewe.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/narekobipozukewebexejit.pdfIn PDF document text
    • https://wecareprogram.org/images/file/78551647317.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/31559023298.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ae57164c5---kemifepemigavas.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086b15772e14---jerowir.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/50282380827.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/73984102612.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/budoxodagi.pdfIn PDF document text
    • http://ciskmv.com/css/file/pexalutuzitaxozobolux.pdfIn PDF document text
    • http://dejede.com/userfiles/file/30108235968.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb80474469---5827524650.pdfIn PDF document text
    • http://vodova51-53.cz/files/vogepot.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971b615a7b3---suvigobofufawasujeduveb.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/78748758622.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/babira.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/gekexi.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/1t6akeu2ni6t01qmk1p8a37574/mevivuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=expanding+expression+tool+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A2 18024 bytes
SHA-256: 3b79329c990e9e85779c5530b9377de270bf1a6cd09efd406b9efeb29a2dc9c2
font_01_sfnt_off0000f845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF845 10756 bytes
SHA-256: b125a046798712a5fa853d09140708faf5ac7dc9bc23b0da2aad141f1e0170b1