Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ae5abbe5bb240d9…

MALICIOUS

PDF

92.8 KB Created: 2021-06-25 15:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: af180fd10ac6cb0b05d755bca5f855cf SHA-1: 334c1ab48502d658ff7f8ea322639694d71b0f0d SHA-256: 2ae5abbe5bb240d96cbceb6ad7d3bca1c1d1a9c55091c530425a5cac17fe3caf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress instances or disposable domains, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=hytale+ps4+release+date PDF link annotation
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b800cd778---72139431305.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/5d2298a74b9d4d103cc32f3bbd710ed2/dapobagufalizigodemudak.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750cf4b79b4---lajejumojiteluzewepulexe.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/a63b2dc7a755897c0d8d6022d6c0858f/litonuxewuna.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/67529096462.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6294631cdf---rizuzolomum.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/b6a3f5513b5dfd3ac6a5572ce37bf9e3/62563211564.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/nowuxabusojojarefobagiw.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd837fefc95---dimerajasi.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/f655e8ddc4b9437b1a7bf75c2f57ab6f/jexukumemude.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210519054556_878494881.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/75067198724.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/nu61cgc9o66tetoslbds2uhh64/47330556095.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b33008cc5d---45975125988.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609e346931093---97133242525.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/niwemixavabakumirakuwiru.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_off0001078a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9C 17828 bytes
SHA-256: 2a97604f0a2e71c2d1aa90d110966ae85116e34d02e101058fac77df7d57a821
font_02_sfnt_off00014e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E15 10252 bytes
SHA-256: 5e98f9cf35609e28d9675a3b151dee3bf6ce1072f83f42fc70a9e1c344ea27ef