Malicious PDF — malware analysis report

Static analysis result for SHA-256 f40af0f2ffa5af12…

MALICIOUS

PDF

83.3 KB Created: 2021-07-27 03:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f0896bc4063855da90408ee026315cb3 SHA-1: 36302f87189a4b726e9ce0b7d9fcbdca7c1ce2ff SHA-256: f40af0f2ffa5af121d6901837a1f58ab5854f432f1a9f51061699154273cf243
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites hosting further PDF files. This structure is indicative of a link farm designed to obscure the ultimate destination and potentially distribute phishing content or malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://daleel.global/wp-content/plugins/super-forms/uploads/php/files/eekk0rnos6ab1f3o1moiedcav7/26062384098.pdf In PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/h6fl65v9pfutladqigq5groqp2/79405176322.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/d3j9st1i2dnhh233iqnevb6651/95265387389.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/radusonovilosiwivosipo.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/84ab482fa8237cb89113f00069c039af/76165341808.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/59fa75cb078bc6bfe941f605173ac8c3/luzomewawasorar.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/78063368412.pdfIn PDF document text
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/65938858364.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/kijinazem.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/e7b33ff788c262fde89a63bc212bee85/93007402363.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ecf274632---60884363481.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160acd96dbf61c---135357682.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908b52ac4e1---rujetudiviwojokizafefije.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/tba8h0qletqcf9ctic7obmttu5/finetukamepugujelorab.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/rezewagop.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16084e81266b35---lijoritewalidisidekiru.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b55cac9b54---bumudafanaziwalo.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/93013949003.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/xezuguxuvedo.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/3ca82f6049b03c6b1e90400f113106a2/dutenoxotivat.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/somapowizutijoxatunij.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/xexak.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/80859643538.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/15013159597.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/fe375fc6e29494b124909b3dfdeda9d5/rifetawigirugigebuke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=tan+application+form+49b+in+excelPDF 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_off0000e158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE158 16900 bytes
SHA-256: 6d04b65723cb8b928f4dc8f74168e99cee3516c86cb7b8ee4a6e36b160b8dd65
font_01_sfnt_off00010d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B6 10924 bytes
SHA-256: f8f90fc11ba4b0c217b9740f2c23024d15591efdcf85c2a2cf267c3571a9ad09