Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdf84324b806fc45…

MALICIOUS

PDF

83.1 KB Created: 2021-09-04 14:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f80c7309c77357e66bd997177718ceb7 SHA-1: af61a4c4cb99943ea78c4367e8ac408f3a7a2278 SHA-256: fdf84324b806fc458799d9a30e48cc80b387f18f9d5f7ec304f3d9bc833a3c74
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document that contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document likely instructs the user to install or connect with a remote support tool, a common tactic for social engineering. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://queure.ru/uplcv?utm_term=karen+horney+personality+theory+pdf
    • http://proart.by/media/file/poluxovewififazu.pdf
    • http://sugarfree-gelato.com/upload/file/xixunizikesaginuvaxur.pdf
    • http://vattuxaydunghl.com/userfiles/file/bekafajabixed.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/82bc1829e110ff1b644723860dec771a/jadaxenivewibojezakiva.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b094fa25af---tixikivisusulanol.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5087a3bc9---23018149418.pdf
    • http://aczelzalog.hu/tmp/74482923305.pdf
    • https://plasy.com/uploads/file/73833809214.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/o1amh7f8gi7jc464eb5q89alqg/1851807025.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611a34c7ed7f9---59223860604.pdf
    • https://abeess.com/userfiles/file/dapanobotirubemo.pdf
    • http://le-bouquet.be/userfiles/files/lobovazijukuv.pdf
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/29cf68176bca6252e74aa48d00f04e49/zafuzurama.pdf
    • https://nslogisticservice.com/userfiles/files/27493662675.pdf
    • http://ccswcd.com/userfiles/file/kerotuwuxuvuzil.pdf
    • http://laptopcuhaiphong.vn/upload/files/50636425228.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160af91aa767b6---78971500548.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3266c1f18e---8175888200.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160764100b5d1c---netisaduxo.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/759d8b04e20e2b86c1658fb010eab704/83416374679.pdf
    • http://angelofthewinds.org/ckfinder/userfiles/files/motepiro.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_off0000e112.bin
5d7003ca5cb27900bfb7e6a4bd7a9ad53f779d5635278d73d5f3885a1c8e3541
pdf-font-stream PDF embedded font (sfnt) at offset 0xE112 17456 bytes
font_01_sfnt_off00010e33.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E33 16792 bytes
font_02_sfnt_off0001264a.bin
0ac73844c1ab2532958b358a096bc59bdce4a88f7a0b2b15e886d4701a127b76
pdf-font-stream PDF embedded font (sfnt) at offset 0x1264A 10700 bytes