Malicious PDF — malware analysis report

Static analysis result for SHA-256 379ac6ad81a58d4a…

MALICIOUS

PDF

77.4 KB Created: 2021-06-29 01:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b5a02a2b9aef44310aafbfd7d8f4cba5 SHA-1: a9edeadc025813b7e2103f097161e4b377a64857 SHA-256: 379ac6ad81a58d4a12cf121e140b6be050dea3d1b6bd6292e26f9579ddfe7739
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing pages, aiming to trick users into revealing sensitive information or downloading additional malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://drafthe.ru/uplcv?utm_term=not+so+short+guide+to+latex
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/b797ddfa2469d37a1a25a4fb444e8080/xirijalilenuruzalamen.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/q9skq52cgvlvr9ivu1btta7ggf/84843037534.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/v39p8k5daapn80eg90f1lvojoe/34442756547.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2a1739c4e---73582213762.pdf
    • https://ecohort.com/userfiles/files/zikofawexapepepupekovow.pdf
    • http://flywings.sk/UserFiles/file/34631276856.pdf
    • http://bsa.by/ckfinder/userfiles/files/goxuwuxofomasizozaweluduf.pdf
    • http://nitexprofi.cz/userfiles/file/wosinowiletivaketajeri.pdf
    • https://angel-juicer.com/FileData/ckfinder/files/20210617_8DAC82B0C60BDC15.pdf
    • http://elitaliaweb.it/upload/file/43736891164.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/926b6b90e2e8d01ea2284c8ca0f5a917/84564715735.pdf
    • http://srub-servis.ru/userfiles/file/pesitidefupurun.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609af41e64f8b---wuwunasenowi.pdf
    • http://ortetel.de/kunden/schurig/ckfinder/userfiles/files/9455549057.pdf
    • http://botosani.ro/img/uploads/file/87471884008.pdf
    • http://amuseonline.com/absite/userfiles/file/jozavekesi.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/63dd040dc6e5435aa4d9cc85fb764236/dixevetijupigisumed.pdf
    • https://vvpta-irvine.org/userfiles/file/nefuxidexipesuwug.pdf
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/aglc1gub5agvnnjt7dp51npc7s/lokolemofodup.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796c45da297---pekupawefot.pdf
    • http://absolutelyneon.com/userfiles/file/xagaredufiz.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16076c78f2472f---jininalagoluxezugutivi.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_off0000c9d4.bin
552eaf789f7d25d8e9e1a3a7142ba26a62092c34063f57f3ce9ee1805207602f
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D4 17656 bytes
font_01_sfnt_off0000f82f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF82F 16792 bytes
font_02_sfnt_off00011046.bin
4a856e18d9b7859ffef70fd0afb1f36934fdf4578f1ede971fba5e04e0f2f7de
pdf-font-stream PDF embedded font (sfnt) at offset 0x11046 10604 bytes