Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f1b18a233ff4f25…

MALICIOUS

PDF

89.2 KB Created: 2021-07-05 15:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e65dd5cdbb92f1b202df0d2a8e2c961c SHA-1: fd0316274d8ce52df64128850790665f383235fb SHA-256: 5f1b18a233ff4f253833fc23298f8b3f6149deef1bfd7c878bce4938a83a3039
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, likely intended to host malicious payloads. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document is designed to trick users into downloading a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f50b21c434---bosubewupil.pdf
    • http://accessiblevehicleservices.com/userfiles/file/9370077053.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/9d0bba45292c5878ad5d349165880c2d/78400473444.pdf
    • http://wildpflanzen-planung.de/file/31547118715.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a3312a394---gidovinurezag.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608696b44f04e---gudevesi.pdf
    • http://digemnd.com/UserFiles/file/13787151444.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5d47f0db2---11250544556.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609224835a28b---28729326101.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a52b09ed7---36625469030.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/90469262928.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0592a0b288---nosokomelutotivojud.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a419868a9fa---rekegiraluxedalijulogikor.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/a79f49d654b941899ba46f48b6c28c21/83289451768.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/1055f9a861d0d7b4fc7fadd303c63f26/babitubimiwevuvatulubom.pdf
    • https://anandamsanyal.com/userfiles/file/nuwijel.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16077b04d47d2f---25941287531.pdf
    • https://krassimirtaskov.com/userfiles/files/muxiwixatopot.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb76a30e3d---bawotuzusoxekepatotifu.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d095de8ec24---92936609695.pdf
    • http://corporacionnoa.com/UserFiles/file/45952790819.pdf
    • http://velocimapper.com//webfiles/file/sopubibotulo.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/0mqftridodcovl2pvb47aav7j5/tufapibuvibozaxigabod.pdf
    • http://picfs.com/1acmwz
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=computer+graphics+by+udit+agarwal
    • 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_off0000f91e.bin
5780863831401c269b2abde84f13537fd4603a51669d6e0cd1d1247a0b6d5087
pdf-font-stream PDF embedded font (sfnt) at offset 0xF91E 11328 bytes
font_01_sfnt_off00011379.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11379 16792 bytes
font_02_sfnt_off00012b8b.bin
54e1439e65fecb84503fb6c3953bf0d20f070257aae4556bd261ca20993e85ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8B 16992 bytes