Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d38e20c1780c603…

MALICIOUS

PDF

72.7 KB Created: 2021-09-29 04:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d1b2b7712c4992e5985e14d547f2622a SHA-1: d740be20ff733c587b29143deefa7128757da9ef SHA-256: 6d38e20c1780c6038dd9ec3a3eaf3ec144c3236a5a5ac902136d453622239e7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to distributing unwanted content or leading users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://crewmak.ru/uplcv?utm_term=how+to+get+comments+on+instagram+for+free PDF link annotation
    • https://medgal.pl/admin/ckfinder/userfiles/files/mikubatava.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/tafovipulir.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/renexiwapusukin.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/burumixeduzixakix.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/4dm8m63pud5js4m4bpjl2ufih1/28924605078.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/20459733052.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/gujuxevepof.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/dagoveda.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/96563574969.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631323673_28ee665cc6.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141bccb55994---4823125715.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/46246036207.pdfIn PDF document text
    • http://test-immo.com/file/gesanivewitega.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614467ba3bf4a---tipufiguzetumowevajudubil.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///29822277043.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/22791080799.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/44109058382.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/lobisesixofuxibewe.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/86720329253.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/4070258550.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/72830841772.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/68968483855.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lq2dd5fe0bilgbn83585qcgle7/86772183341.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/menawagukixulimawo.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bivogojev.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/2309667414.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_off0000b791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB791 17220 bytes
SHA-256: bee51e79ad656f3b5adbd2655aee27102be075e684e2c1518dc9dc26fcace93a
font_01_sfnt_off0000e426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE426 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3D 10712 bytes
SHA-256: 700e74947c18490a5a84eba623559c033f0d7918f6b60ec807387af7b92622e3