Malicious PDF — malware analysis report

Static analysis result for SHA-256 508e406aec15b2df…

MALICIOUS

PDF

89.7 KB Created: 2021-07-05 15:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e3851cc7cc1d117795bdf92ee4608ac7 SHA-1: bb746f023d2abee273dc429dec714fa355606cdf SHA-256: 508e406aec15b2df999dd9a6cea64017a4d3e1365b9786098344fe2d59861f07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to host malicious content or redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec706476d0---27454662309.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160a71f2fce7c9---zenokasewave.pdf
    • https://carrieres-pierre.com/userfiles/file/fakepe.pdf
    • http://kstarsmall.net/userfiles/file///90323761246.pdf
    • http://sns.hu/_user/file/33984523341.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789b30e4386---22736911927.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078d11922f6d---11083756019.pdf
    • http://scheidungsrecht-best.de/userfiles/file/84076592282.pdf
    • http://artospace.com/pics/file/1512894015.pdf
    • http://lavalnerina.it/userfiles/file/94487819554.pdf
    • http://belgium-ex.com/images/blog//file/96727599152.pdf
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/kabonosazipitagujuro.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070307a9dcd7---fozivoxemerarewizetuset.pdf
    • https://bbpartner.cz/userfiles/file/rigagoxiraf.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/s27drkqsvo85i5pui2e3t3aqbt/57172838559.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dddf5322616---fobavisi.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/7993d9b47f557e1616d6f4be94d7b30a/3134179269.pdf
    • https://transport-vehicules.fr/userfiles/file/nofefibiredozexak.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aba7ad16cbe---bizudinuzupisiri.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a22a21979e3---29550202447.pdf
    • http://poorclarescork.ie/images/70216776043.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/489c42948b4ecbb0c1267b012f4c67a6/51049971413.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c3589f0f251---92822668277.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00f5330d14---10021536643.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=cleverbook+pro+for+minecraft+1.16
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3a9.bin
7b145c0826b9f9da6b9a0712e466a2fb0f025296e8bca2e020a4cf15c1ee9c7e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A9 17876 bytes
font_01_sfnt_off000111e9.bin
f4047e02629af9c9545ef2a87bf62a1b8b1d4384b58d79c6e96352daf1877448
pdf-font-stream PDF embedded font (sfnt) at offset 0x111E9 11088 bytes
font_02_sfnt_off00012ba3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA3 16792 bytes
font_03_sfnt_off000143b4.bin
fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
pdf-font-stream PDF embedded font (sfnt) at offset 0x143B4 16164 bytes