Malicious PDF — malware analysis report

Static analysis result for SHA-256 d77ec960b87a07c5…

MALICIOUS

PDF

80.7 KB Created: 2021-09-13 23:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fadf9200161576c54ebb0e8b2d5cbdb9 SHA-1: 11e9f88aa3d6d7cdafa2050e0356716dc0192a32 SHA-256: d77ec960b87a07c590f62d0f84ed62ee4d7db672b62bf2d6f79ecb4e5ac4b413
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS upload directories. The document body is unreadable, but the presence of numerous links to potentially malicious sites suggests an attempt to lure users to phishing or malware-hosting pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://techcessgroups.com/userfiles/file/gazilidirazakamukabukaset.pdf In PDF document text
    • http://turksebruiloften.nl/userfiles/file/60186208151.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/bekenumatojawadigevowebew.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b755cf63e---toliwiz.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/lavitebaxupotamu.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/joroxodunal.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb6605143f---zaxiruxopofizinipodoxepi.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/82541666057.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/gupidexivozabulapu.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/31131854976.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eff8de515b---25981878392.pdfIn PDF document text
    • https://etimes.mn/uploads/files/nurutorepipulugazodeme.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/6f8725a239b5476e43032719fa3fa493/93094187445.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/70905007651.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/dexoboresarabazuwulezo.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/ketuwisimumizidutenevejis.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/gapisanikutufosebenufid.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/9118284915.pdfIn PDF document text
    • https://mackbeks.com/files/file/pibimuxalibog.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/tadepo.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/53780095726.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/65219233004.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=difference+between+custom+rom+and+stock+romPDF link annotation
    • 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_off0000d4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F5 11008 bytes
SHA-256: 20167dc1b5e64f86e7c16a00a8d2f74b7f732142ef41e400208e54b3d92f6a4b
font_01_sfnt_off0000eea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA6 18016 bytes
SHA-256: 0cb14060c6480560fd93da0fe38dbde65d7884da27ffc034b599481326bff6b4
font_02_sfnt_off00011d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1