Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e19c6fc34c2aa51…

MALICIOUS

PDF

87.5 KB Created: 2021-07-02 11:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab2252b77259e12ffec70807ebe5cafd SHA-1: 2c39865c938621727c10ff0acee7986f4e158280 SHA-256: 3e19c6fc34c2aa51f1cc765fa82eda91b7b1495f4bb885eb48520f34a7851b0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://africanresearchcenter.com/userfiles/file/gufixiwuxutitomolabepa.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/rvk5nj1uumdc1kcuemh2r7as07/93172627288.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bb598f0f897---kikazi.pdf
    • http://timebymtm.com/upload/files/xepurasovatijesa.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/6f627ca5ae5cd98b01026efd6214baf5/6223886411.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817c6488a74---39601246417.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/0pevgucl9rf0o90geut12jm2nf/melumeverejigebugekubedum.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e803eb4f58---zufuzo.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/7a2cef98d4d35b8397c6334755fca399/karevexafisabitupatep.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/gar3mq6ug010e3mq3af8vtgfk4/kekasifazuruxujesa.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/3d43884f2d064980ad55f3eaf6f56009/rutixaludizarozenajirawub.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d21ddd83212---sujen.pdf
    • https://govox.co.uk/wp-content/plugins/super-forms/uploads/php/files/4gr3b26jdklv00ahrs3i4nnn1k/76295252978.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/nes5rlevgg2o7j3ughtqr5apm0/bopobexolukitalorajuvujam.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/73d595db34c1237e92fb4565540f4232/75823238761.pdf
    • http://nirmalamathachurch.org/cms_uploads/image/file/95287205.pdf
    • http://kompletucetnictvi.cz/files/file/zebiwovug.pdf
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/29603115388.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf40dddae---20716063938.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/d4e3882e12c93170e499192e53f2744e/lapakoli.pdf
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/e799875aa3ee3261a34d1539a9537688/93525395136.pdf
    • https://marjoyunlar.com/calisma2/files/uploads/28407089873.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/90a1398378f9e32c64c29cee9bb93ed1/16832104843.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/fda9337b3f8c7a64e637d08e826f4c77/witanarijagugumemupus.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/4fa9367ca231b8d9b29428da671ee65c/18118272689.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=tell+me+about+yourself+example+answer+for+fresh+graduate
    • 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_off0000eee9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE9 16792 bytes
font_01_sfnt_off000106fb.bin
89ba9a2a0310211f0d40cec942e20915d77d6f527f6abe26012d92c8e80f27e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x106FB 17380 bytes
font_02_sfnt_off00013422.bin
169ee96d33149f89447a676c9a36003e2eefd1b8ba6b26ddc714d2956e45aab5
pdf-font-stream PDF embedded font (sfnt) at offset 0x13422 11360 bytes