Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ddab511875b00fb…

MALICIOUS

PDF

71.8 KB Created: 2021-06-24 16:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 9ebfd0eabd156f598b146ed6ec59ba5f SHA-1: 76dca619c5dba9ab322548abaa36b7aa7f0fbd9b SHA-256: 3ddab511875b00fb28602744cb9c9226a0a4bfa03ca608bf90be3ad3ad4e8a32
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of a PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the ML classifier's high confidence score indicate a malicious intent to distribute malicious content or phishing lures. While no scripts were explicitly extracted, the structure and heuristics strongly suggest the PDF is designed to exploit users through deceptive links.

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://smidgel.ru/uplcv?utm_term=pdf+file+editor PDF link annotation
    • http://geose.ru/userfiles/file/46970405804.pdfIn PDF document text
    • http://clingac.com/d/files/pujizeguv.pdfIn PDF document text
    • https://marosme.ro/hirek/file/duveviziwawojidured.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/f993108e7da31beb7c58bde2085b8979/gakegulodinekufixo.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210529045117.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/31627571465.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/9633475e8652ff0117789eadc0f55f8e/35851251924.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b788505cbd2---derexolivimefop.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b4c92d8ad---51427398041.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/ridazureborakeroleniza.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/85455574099.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/f21d2c4fc481d7a980e581477264c61e/99509986114.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/pazaloma.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/a8d85882783d752fa75dcb4b9e1d9011/7516733152.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/74e720a42c3dd867bebf4b5407c92ffa/toxosedawawomu.pdfIn PDF document text
    • http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/niminifigexorapilawa.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c3e9abac3---morajonabubadupazivod.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_off0000de91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE91 4516 bytes
SHA-256: 4220fa369f39cb745314d90a2ab5619c1e1ebbbc375653ce4b833e71734649fe
font_01_sfnt_off0000edf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF7 11008 bytes
SHA-256: 2803f6808ec18ae8426f066fc79df6164152c7b7dda4326b56e42ab8f9891696