Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1cc4b07f0f13dac…

MALICIOUS

PDF

69.7 KB Created: 2021-09-27 05:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f8553268890fbee086688ebdd2ea2a8 SHA-1: 113278a35b9f983719489facc849e09eafeccd0f SHA-256: a1cc4b07f0f13dacb207d06b009a0c22f4a3a5fcedbdc06283a65df20e645358
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://synerhu.ru/uplcv?utm_term=monster+manual+iv+pdf
    • http://mh-gartengestaltung.de/userfiles/file/mevosiboxu.pdf
    • https://mimpishio1bet.com/contents/files/95044270311.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c393e6dfeb---12512782290.pdf
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/movajapufexogipixalalexe.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/c4bdfa73e2fdfbc4e940485a8d60df34/motixozuwebeguzole.pdf
    • http://stroyindustry.com/userfiles/file/30596880391.pdf
    • http://myagreement.com/UserFiles/file/gorijavumevutebu.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c6d3363fc0---tidozosoxomulopilen.pdf
    • http://classicalgardenfountains.com/uplds/file/89796718797.pdf
    • http://alacarte-husum.de/userfiles/file/pudifufitodame.pdf
    • https://xuantruongtech.com/images/ckeditor/files/nopodeje.pdf
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/77448246954.pdf
    • http://tavaszitura.eu/userfiles/files/1629890947.pdf
    • https://volandovia.it/public/fileeditor/file/bewodidopexena.pdf
    • http://titusauto.hu/kepek/file/rolanomuwifugetatitisuv.pdf
    • http://theclelandgroup.com/img/upload/file/67933596416.pdf
    • http://orderkai.com/uploads/files/25123109878.pdf
    • http://nesthomes.in/userfiles/file/97444014352.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16135ca4f7f419---52454631740.pdf
    • http://clubesquilacoma.com/uploads/files/xazujofevupuw.pdf
    • https://www.domosystem.gr/ckfinder/userfiles/files/25265910916.pdf
    • 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_off0000af70.bin
3b20e9828c1b4aa10bd3c0db9efabd195621600dc95e83e0de63ce385172f1cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF70 15876 bytes
font_01_sfnt_off0000d827.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD827 16792 bytes
font_02_sfnt_off0000f03e.bin
9559276f1291d13b9bf1d52c39ff3b6c6cd77d9f6671f7ce5e0bc6340a2c84ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF03E 10820 bytes

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