Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aa84dd0fdb2274f…

MALICIOUS

PDF

77.4 KB Created: 2021-08-03 06:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: eb3bdb35530ea89d45b91ea029204d76 SHA-1: 75e924dacc12bd1f6d03a37cf481a87725faf952 SHA-256: 0aa84dd0fdb2274fbf8b9db97539ac4962d8321ecd5b4786438c1028592c76cd
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, several of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/9213280838.pdf In PDF document text
    • https://asi-filter.pl/files/file/vidadomutewosifuwura.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fb6728087---4219199238.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/74513530964.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16070569723099---regoxovev.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/83227578868.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/abad0bf95fd115cbd58fc7dae1e6d729/gobobagekowimolupomaper.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092cbc13f143---vopamovudamagemij.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/dagojuvupenis.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/f4a59562c5b1390d90fc6ab48cb7a238/54896090339.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/tabuwefezugefifilok.pdfIn PDF document text
    • https://blv.by/upload/editor/files/23601124737.pdfIn PDF document text
    • https://altbuket.ru/files/dowixutapiru.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/6ee1ab796263ea342fa1b82c7f856dd5/70830108408.pdfIn PDF document text
    • http://gdaniec.com/upload/files/pufuvobamovabamezekasel.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a435f48264---seketijeruzogemubenir.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607492f709338---jogipugi.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/87502977820.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/a40c1722918f77fe31532e1dd3cbb9bf/namevizok.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-7/file/63653296972.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/fajuperutazojolowokalozu.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/jaxuxidejaritikomami.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/92535747929.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/xilipofiwalososez.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/78050612834.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=arborists%27+certification+study+guide+third+edition+pdfPDF 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_off0000c954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC954 11220 bytes
SHA-256: 6dc098116a6892492a10f9470db8d19bc0a388b32a820b6d85f05849c138ff33
font_01_sfnt_off0000e33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33B 16756 bytes
SHA-256: 0cd7a052392afe0ae24b6e7618ceff19ed6374d3cc3243b2bf581104a0e3f862
font_02_sfnt_off00010ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1