Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4fb40c01e21077…

MALICIOUS

PDF

87.0 KB Created: 2021-07-12 23:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a62ff870f6ad63f162bdfa5ebf6eaff1 SHA-1: 713b46791480d23fb510500be188873537d7d2b7 SHA-256: 5b4fb40c01e210771f596b0a5bcb1b104da2607eaa2fa26fd7b1543da5928926
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://queure.ru/uplcv?utm_term=merchant+navy+after+diploma+in+mechanical+engineering
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7377d8251---bepon.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/rstir4fsi6b0bg3a7q30lvhep0/bowikesovafomo.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ffe7007c8---9117197551.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160afc24b1fd39---kenirupurebazizejosukikup.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b16f6c27c9---55876231849.pdf
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/33395823180.pdf
    • http://esthebel.de/userfiles/file/gavizasasorenep.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/3f49ebbedf22dd87c99971d4d78cae80/ralukapi.pdf
    • http://www.malagatour.es/ckfinder/userfiles/files/dijijodesewogixumozisojez.pdf
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/5d1d4209a056650b75d92415be9d9c0f/tazevanetowugidadizo.pdf
    • https://preprodpcb.com/userfiles/files/52238644033.pdf
    • https://morabia.fi/images/file/26432890028.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f65c5abfe9---wejiw.pdf
    • http://24cvety.ru/upload/files/27517767053.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/106a8a10df2c27fa8b873382b530c662/temitarotuvipewubetinizu.pdf
    • https://securitydm.rs/slicice/file/venatuwak.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/b2982a7cd3a005d54357a647a693ad50/16007967285.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aead85b51e8---kegepetezazotimuxidixir.pdf
    • http://barrybusiness-crm.com/ressource/devis-photo/files/duzibugimaxigafijafuwu.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ae11fd5181f---58635017578.pdf
    • http://sva-jeanroze.com/xmedia/file/43975716867.pdf
    • http://veoguidecostarica.com/ci/userfiles/files/mobumalobifusugodifovi.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f331ef2f5---66767573317.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c273042dee9---jarokubosozutetirolezawa.pdf
    • http://sbox-technology.com/upload/datoteke/futafo.pdf
    • http://e1pl2.nazwa.pl/busy/fotki/file/98852788949.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_off0000edf9.bin
9b02e4175ebcbfa085d78bd125dbcdb938b057c726864f9a380d0ff7f252a03d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF9 11072 bytes
font_01_sfnt_off0001075d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1075D 16792 bytes
font_02_sfnt_off00011f6f.bin
9612e2d01077be06539fa95dd9e69c2b22ba8aebad0eaa4358c35f41ef26769f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6F 16980 bytes