Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cfb9c3e87758ba3…

MALICIOUS

PDF

100.3 KB Created: 2021-07-01 19:17:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 44f6e3b602690787a09cfed27ded087d SHA-1: 79e51daa6f4a2219ca31f06e30e4fe04665f92be SHA-256: 2cfb9c3e87758ba3b66e2b710094ea8a01986d5d2f3c7c6ca3640e96ce9c8641
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/a737968e617abc883a3f77a22bbc2b73/fabibudamawerevinupato.pdf In PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/a481ddc48f25ef87ed38fa755242107c/beginerelumir.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16097ec9ff02a7---jamuxaleseviz.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/kipak.pdfIn PDF document text
    • https://cooperspick.com/files/72090955426.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b350c19dabe---17679786483.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57ac512cbf---suletefamiw.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/43494087116.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/mqq746euf7495560kv60mu3q43/38251022851.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/fagokedodamivebifimuxob.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/6e11bqfeuk8kitdmbaluftipkd/18412432180.pdfIn PDF document text
    • http://juentai.com/userfiles/files/36577090082.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/vurevagojuruzoba.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/88959203439.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/rovurutikitegi.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/guv04u6rl5n1rv5npgc3m1vil5/zijizuriboluj.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/jubesipemewomixo.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/zofivuwapiravojelezilek.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/99471919502.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/71c090e3dedbd508a0fc8fbf949f0afc/bajawijogejuxitogewima.pdfIn PDF document text
    • http://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/31926016790.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/e1887e8d6db9f45abb789ab8a666a27d/96733540341.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/617096c6aeb2451d49bf5e972f39e28e/sudonaxem.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/5e1d12debdc3ecc6bd068531f58de7d6/lalujapaxug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=jimmy+james+and+the+blue+flamesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D1 17352 bytes
SHA-256: c758af4b5c1ab3b23d650ad9ec82c5989e5411a7ed3b596c19b15caef83f71cc
font_01_sfnt_off00014544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14544 2780 bytes
SHA-256: 0a7244a9d52329410698d0025344fbfaf67e8a218070ed3141bf6634b0503d0a
font_02_sfnt_off000150c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000168d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168D8 10876 bytes
SHA-256: 685589ed2375afac9bdc10cbd4c33a58b8be3b03deb0088848a0d08e75be25c6