Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0c1c33a306b60b1…

MALICIOUS

PDF

68.8 KB Created: 2021-09-18 09:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 86e3913f9513b2ca27e5ae7d4b8c2a16 SHA-1: d76c37541270053a1b10ff326d2fdcb5b8d58dbc SHA-256: d0c1c33a306b60b161f136127f6a82c2b74a84a9806295feb917ba94c307a188
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as a Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many of which appear to be part of link farms hosted on compromised WordPress installations or disposable domains. These links likely serve as lures for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://oniceh.ru/uplcv?utm_term=launcher+beyblade+qr+codes PDF link annotation
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebf42bd2e7---nevudokijabuwodun.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/66239968934.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f41b05ecf8---lobozofolidipifixolewajun.pdfIn PDF document text
    • http://mislenyiallatorvos.hu/userfiles/file/80685163645.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/64019335354.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/95941496439.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/junajef.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/nunizuluvikefigulekovuwe.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/kibabijefababekisagomi.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/netutozovogofak.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/32779090972.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/32966725097.pdfIn PDF document text
    • https://people11people.gr/uploads/File/69654072052.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161455c057677e---83018455134.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/kujudepo.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/43153740365.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/rozekaguserep.pdfIn PDF document text
    • https://novsport.com/content/File/vaxafa.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613852323d8ea---49661857472.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/58905678737.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-2/20210902045806925986.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/rewofibaletap.pdfIn PDF document text
    • http://gibisch.biz/files/files/pavebumesubuv.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/xexibatazaxu.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/20636041450.pdfIn 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://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_off0000b176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB176 14392 bytes
SHA-256: 68c61f657c9ebb7d25c60f8bbb621076aef18950d96fbd4d32a92807cb1c2b35
font_01_sfnt_off0000d558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD558 10732 bytes
SHA-256: f52cd52274c86d8c5cee281c029e5f63c8b0e7ba680133534c737afb2ba5391b
font_02_sfnt_off0000edb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1