Malicious PDF — malware analysis report

Static analysis result for SHA-256 171567e520396034…

MALICIOUS

PDF

68.6 KB Created: 2021-06-16 07:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5101850fb5fc3ec07db265191a52491d SHA-1: 945f2d7b2645fe3704d60f489abbe8919b630700 SHA-256: 171567e520396034c9b4833c2a175c07e5b4a1eb4d988df6383b6cc2f191692b
156 Risk Score

Malware Insights

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

This PDF file is classified as malicious by ML models and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to numerous compromised WordPress upload directories and other potentially malicious sites, disguised as a search result for free movie downloads. The embedded URLs suggest an attempt to redirect users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crysiq.ru/uplcv?utm_term=turbo+charged+prelude+2003+full+movie+free+online PDF link annotation
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609000d670f30---vifidotosuliwaf.pdfIn PDF document text
    • https://luminex.pl/upload/file/ziwisojesoninegez.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911afd59d17---givosipoxanef.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210518104525.pdfIn PDF document text
    • http://www.serenissimaservizi.com//files/sedekigatafenem.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/f13d0819f8ba184663f4b8f8989a960a/85927919649.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/090b611531339e682804f98fd2e681db/xefatemif.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608099938e5e0---kabosapigojulo.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/p7th7rcf1ppv85s2bmk0lhi0nr/54877868527.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/bomorogawagoxakerut.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/toxemuladozobedalimev.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/nuzodadekamemozub.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/v2n3bfbp8l2a8hu4tunfml44vh/1191347957.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/sekisunalevopilumika.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3b9b42b76---35179910015.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a72435c29b1---11119083435.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_off0000cb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4B 5976 bytes
SHA-256: 56698ace7f270383b4a4e7f9a501dc11bbb7665911275be8c871b58b133c7640
font_01_sfnt_off0000df84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF84 11040 bytes
SHA-256: 66fe3851e76456bcc11aca396c87b2e6deec8c53829568dd04b71b178e7ebbd5