Malicious PDF — malware analysis report

Static analysis result for SHA-256 254413a1f315cd5a…

MALICIOUS

PDF

85.5 KB Created: 2021-07-08 06:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 210b53c56e18d4cdd6c742d509a81ec9 SHA-1: a8613204520bd5ae0be441202d4a02ca8e6e9dc8 SHA-256: 254413a1f315cd5ab4d8a90de5436ba797dc56a4bd7888bb71e80ec83d11e184
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/dae2a11876bdcc8d618e6d592bd53888/wejafavamilaxi.pdf In PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084dd8a48947---48742781110.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ixibuwu.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210621132215.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c562706dc0---81342309568.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents//files/sidaf.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f98a570b7---47037153857.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d2315c5f405---58399770918.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/40460280258.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/07c6e99545e384e0b31584c4eb03a759/57085121876.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/25038365421.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/14514874133.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/fuluzat.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/0a6a94293dbc6dafa934b16fbf03ad77/86284463964.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/ekbgnqm8oi8mu4b543446os4pj/26689904633.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab5915e1bc---67599380916.pdfIn PDF document text
    • http://bakerfamreunion.com/clients/1/13/13be4b03bdabdd3a133c3ee64ed6201b/File/10333405557.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/66730115486.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb0da5798d---vizifazobitutur.pdfIn PDF document text
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/jijuk.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/70413578248.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/e899b959b581638c763a896a3b125fd2/33904681381.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/vagiwavovevudo.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d043ea80c9e---fofutose.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/d8cc5ba653df20ee1f86882ceda2c983/xudisifijotit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=charley+atwell+titsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA1 16848 bytes
SHA-256: a7d1c3d09b40e5ea614b3fb20cd44c44ddc039c2a6579634f63e5fc341763689
font_01_sfnt_off000119b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B2 10212 bytes
SHA-256: c751edb427d89f5c4b0b2c40d22d2c9a36d49c1fbb9d3b7925aa0f232bb3ad4b
font_02_sfnt_off000130d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1