Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b3cc8999d4b94d…

MALICIOUS

PDF

72.8 KB Created: 2021-08-28 10:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3e0a677ebe3c8d7e9b6d3f2dde06dc30 SHA-1: b36a06d11744f6d63df69f6e671b06ea8db98819 SHA-256: 61b3cc8999d4b94d28e8c0fea3dd825e75c98a01efb1c04bc3fcd765fbd55802
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely serving as lures for phishing or malware downloads. The PDF structure and embedded links suggest an attempt to leverage SEO poisoning or similar tactics to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://coretry.ru/uplcv?utm_term=best+roasted+carrots+ever PDF link annotation
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/cddbe094efe34c17ede8fe4a4632cb4a/62450423514.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/suzifojewopawakapupiw.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/koxixilowekigotudu.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/luzoza.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/valemuxiw.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/22d78ebe8606eea1611860e3dd88c3e6/xuzufexililepixalebev.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/57856405001.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/winetapi.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/953b34c45cbd7f06cc16fe33cbbec540/79495872582.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e303c9c571---6530301622.pdfIn PDF document text
    • http://df-foundry.net/d/files/26173423284.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/2676c1f100da2a600b25071ea70ae430/28131272114.pdfIn PDF document text
    • http://riph.pl/userfiles/file/fagejatovoxovu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093566cd8b61---48665789766.pdfIn PDF document text
    • http://lse.hu/userfiles/file/nofikolix.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607813b5a42bc---68428240404.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/91683112495.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021081507433787.pdfIn PDF document text
    • https://wagaskar.com/media/70722848634.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/7385947023.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/gofavimu.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/romisa.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/pikotofizaxizelisali.pdfIn PDF document text
    • http://menafundinfo.com/userfiles/file/93039900067.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/pizabupevimen.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/40451047933.pdfIn PDF document text
    • 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_off0000bd3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD3F 10240 bytes
SHA-256: 1c1db96211e8f82f0ceed38b958e5de6a0697bb4a9dbf688a1ba23ad1896e9ba
font_01_sfnt_off0000d476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD476 16092 bytes
SHA-256: d79362e1963f4d7d7e30ae9019ffb6fa59a4a6025536181ae5f24ca4572e1329
font_02_sfnt_off0000fceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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