Malicious PDF — malware analysis report

Static analysis result for SHA-256 f33fe8e6459e6237…

MALICIOUS

PDF

69.9 KB Created: 2021-06-05 06:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c695e979d74285722f49e055840d997f SHA-1: ffdd1ad9928c0498816236a169be42700dd4a724 SHA-256: f33fe8e6459e623730125275a57a5671b06d1a08d9fdc3f59939317c9ed077f5
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and potentially malicious. It contains numerous external URIs pointing to compromised WordPress installations and other disposable hosting. The presence of a 'Password-protected archive lure' heuristic suggests the document may be intended to trick users into downloading and decrypting a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://nomylo.ru/uplcv?utm_term=arduino+pro+mini+328p+datasheet PDF link annotation
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/8ece44b7ac68fbd5d5f041d420fa6cce/78920372883.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae43dd13e0---16289721172.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/45252856766.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/kskgdva8ttjju1530libfv7155/85707544097.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/tiguwesibar.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95c3987886---31326666390.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a94efc39126---72128544601.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070dda7789c0---gisikamifijupebodu.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075b94c13743---pexaguvelivowoko.pdfIn PDF document text
    • http://technocom.pl/editor/file/wisirojaxij.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/t44mja1gbdln3oer4q97mlpp7b/jekiridi.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/37157890011.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/d626f3b84996c6beae7e444d092b1340/66828888391.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b453009fd9f---27920013136.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/38jjifle6nsk1tkt7dn1n7t9l5/34124733931.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e671aaa07c---bezumowalabuwapubewebu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DF 5648 bytes
SHA-256: e1d444ef799fee0d7b56044bccf4d7abfef8a11a2f129f27130df0b5ebf05e30
font_01_sfnt_off0000e5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E7 11908 bytes
SHA-256: 364a3e7d0007629019c8131f36eed5a5efcaec7172537f3329ca0de9296b7c39