Malicious PDF — malware analysis report

Static analysis result for SHA-256 22b6b22a29d3dbf2…

MALICIOUS

PDF

82.4 KB Created: 2021-09-02 19:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 467f73c2b2575eaafa0b0c0d910b8aee SHA-1: a6a4bb98235668d9bee66205e3eaaf9e51237c31 SHA-256: 22b6b22a29d3dbf24853fd8a787862fea386b4089a5a28fdb0f6e4a1eb1a9f40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and the nature of the heuristics indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://jikaramen.com/uploads/files/92980883112.pdf
    • http://busankid.com/webfiles/board/file///9853777144.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160caea14ac087---nisakaweperu.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/161058c0e39cca---ruwasibobogujodekakesaf.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae83c2347cd---wuvopuxatemikatevali.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8c9945193---4864338550.pdf
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/lutiwadajokibipa.pdf
    • https://stotex.rs/files/68031301739.pdf
    • https://cafepiolho.com/uploads/assets/78052373464.pdf
    • https://pharma-tools.eu/galeria/file/39102737918.pdf
    • http://akkoryazilim.com/userfiles/file/96803136089.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/a354e6fc9b18dcaf9dfa09a0dbb03817/5058133847.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b49692cbea---xokelinogot.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160fda0c87d2b1---60969018245.pdf
    • http://futureinfashion.com/ckfinder/userfiles/files/8049186827.pdf
    • http://diysmart.net/userfiles/file/rafikorefadu.pdf
    • https://umutisi.com/umut/upload/files/vodabosevopu.pdf
    • https://bselink.com/userfiles/file/23463583767.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607843cac4a74---18992760210.pdf
    • http://gsmontaggi.it/userfiles/files/vixire.pdf
    • http://henri-ruch.ch/doc_pub/file/34854388820.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/5fa6335742dae5440021ef4b14c219e7/31197124468.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/b93bf3abf21fc037544dcac9eefd29bd/10066593615.pdf
    • http://wearefamilypalestine.com/clients/3/3b/3bc38fc23f9ffb54b20226cbd6ad6ce3/File/buloxorirejatixiledos.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=a+new+life+bernard+malamud+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_off0000defd.bin
e613f46c491b03023afd8390036f760e932a5fe5a864f19fea2485199cda0fe9
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFD 10580 bytes
font_01_sfnt_off0000f6e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E5 16792 bytes
font_02_sfnt_off00010ef7.bin
8d27a5eb7377ae7fa5911c81c24a319719e3cd475019bf825ed469522cb1cfdc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF7 17396 bytes