Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6b492cb2a11693e…

MALICIOUS

PDF

87.2 KB Created: 2021-06-29 11:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f2a8dd0905e195d83b8152f9b73e46e8 SHA-1: 83c9cfae25ea555c38e5de2b7eb8847ecccbef6f SHA-256: d6b492cb2a11693e7a6fb0de92b287d77bc14cd2a9e197dc5bd03431367dbd00
196 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, indicative of a link farm used for phishing or scams. The heuristic 'SE_ADVANCE_FEE_SCAM_LURE' strongly suggests the document's content is designed to trick users into paying fees for a fake lottery, prize, or parcel delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://cometsecurity.in/admin/userfiles/file/94621661938.pdf
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6800ebc74---6330814770.pdf
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/e006e70b29fa59e014a56eb725aafad4/10757995108.pdf
    • https://ngoctraithaibinhduong.com/uploads/news_file/xupivanukiradub.pdf
    • https://lienlacanien.com/img_pages/file/12743072904.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/51c5ff9b17b6129700bdcae7c82a4f4d/wopobula.pdf
    • http://banning64reunion.com/clients/a/a7/a71e9339640f4be667ed55590a288245/File/75208144639.pdf
    • http://kagoshimakojintaxi.com/userfiles/file/vagexakurifajufok.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/fe2dc48d876a79315cbd1b842ee65e16/bokabinisofotugiwesemeki.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a51ecca0ad5---40423923901.pdf
    • http://55thocscompany.com/clients/62662/File/51208832252.pdf
    • https://eternalbliss.net/file/87857839971.pdf
    • http://beerskiboot.com/img/upload/file/xuwapizipeweburosebufuker.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/d8b5953dcfa3a3956dc59a98d076cc38/vedigigunomusenetubikoxot.pdf
    • https://vannordenvastgoed.nl/userfiles/file/vipani.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723defabb95---fixukesovagiluwonuvuvova.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16094db051f6b7---xorakekarobutesuzar.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/c165c29b3d6143e6ec7d3945bf2eb4ad/dujibizememagoki.pdf
    • https://alternativecarrepair.com/userfiles/file/8237936705.pdf
    • https://playerpress.com/ckfinder/userfiles/files/vubigexefijatagira.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d009dc3384---25438198250.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ovmnurbskhba5oggdd0pk778v2/93347519665.pdf
    • http://modnyi-buket.ru/uploads/files/32181683285.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=meaning+of+accessor
    • 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_off0000ee7f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7F 16792 bytes
font_01_sfnt_off00010696.bin
7ad433c965719de7bda3a284f1b52c65f3560030cd965bfec319b706af89b9eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10696 10360 bytes
font_02_sfnt_off00011e17.bin
4e5d794963e654d3a0d52004746abc337a7b58af9ab83b976bc11e6861b2ec01
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E17 18684 bytes