Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca68d684dc932514…

MALICIOUS

PDF

124.3 KB Created: 2021-06-20 17:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 1c19660efe5c84bf488db519cd06d3f6 SHA-1: 70bd87f044e1beb11991889d97dca9dfea070a4d SHA-256: ca68d684dc932514ae40324d6fca4a96580cecb969a6b539cfd68a5d69047f98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/h2ru3dsejehspflbs2ulcd6adf/bilozakixoj.pdf In PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/8720bab3bc5b21e7b756b7fce9f393b0/87919059988.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/253ac728e6baefb4191173534828f1a9/palakolurefed.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7edf18448---41250114090.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/nuduvixeruwefiv.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/pumuvikij.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/915a0b59945a1840a238eaa1c5279a43/wokadivarupofojufik.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/653b4dfd761d216347df36a9a9d90148/25513681334.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/7e1a32b87578cf0b375f67a97a6e2727/negepeduriboxo.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/64127350209.pdfIn PDF document text
    • https://sanidom.pl/img/file/vofodikubavusi.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/sazafasurutavar.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/222mi9a939conb6t9e6br8js86/17871150348.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606efc823c341---4188325413.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/21436433947.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/f94663b48c48479261cd531787ec9d64/wibopimovur.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/p5h22f7li2b53cjotmv6bk9hnh/82294113413.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/16440481847.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=6.3+mendel+and+heredity+study+guide+answer+keyPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19646 5524 bytes
SHA-256: 18ddded538e5178d011181eaa00859f4bd602093be84032c276064ba28d4e2b8
font_01_sfnt_off0001a8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A8E1 13764 bytes
SHA-256: 5a1398269ef95653f22ee1179763bd58756252193f470554ed063c6a43000936
font_02_sfnt_off0001d563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D563 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378