Malicious PDF — malware analysis report

Static analysis result for SHA-256 c042af11781147ff…

MALICIOUS

PDF

75.9 KB Created: 2021-09-18 23:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 36bc0d1072c345c9bb5115a7f9bb5146 SHA-1: 667be5117ed8aa91c718d159487f0aa6896bd5e8 SHA-256: c042af11781147ffc12f84dc96f847890b5da04ffd3e2531a4bd7826685c8ddc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farm characteristics indicates an attempt to lead the user to a malicious external resource, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://hai-bi.com/uploads/files/202109031044486156.pdf In PDF document text
    • http://proleague.dk/userfiles/file/33513675169.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/45138857783.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/kazeg.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614379024520c---81504066844.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/37296965813.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/17130872938.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/1b3eae50e7a4f5af6715c3a9188768d7/14022640523.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/90680556429.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/59848954814.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/kawezijowinoji.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/6810366535.pdfIn PDF document text
    • http://offerparts.com/upload/files/39581602657.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/27005879511.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/13344055110.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161334a924e341---vakisupemaguvefiw.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b90d5b1940---xalozatexozelozemexefi.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613fada6468a0---rofekuzivubijikelebu.pdfIn PDF document text
    • http://vit-physio.de/file/80084356448.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/92345734152.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/16110655609.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/98291283636.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/3dk785d0uk2t277o7sibkd2cu7/gifeboravovusibus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=best+camera+app+for+samsung+note+20+ultraPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC082 11124 bytes
SHA-256: 1020eece5ede28897dae0861b012fa17ec70fb073302aa2aa0731c8ae1d5efff
font_01_sfnt_off0000da90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA90 18064 bytes
SHA-256: 785af54a624d6bd766ec6d3d54a7043feee131d068affe0aa0de0a4663bd38aa
font_02_sfnt_off0001096b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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