Malicious PDF — malware analysis report

Static analysis result for SHA-256 b71bafd1fbf77bed…

MALICIOUS

PDF

85.9 KB Created: 2021-09-24 10:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f12739de474123c7a08eacd33054e585 SHA-1: 2dc13f6f957c74eec9c0f45fa294e37984012c6b SHA-256: b71bafd1fbf77bedc029aa658af8583fbc0c681143acc58cd7401959d704efc6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to other PDF files hosted on compromised websites or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://marleenjansen.nl/images/uploadfiles/67395862986.pdf In PDF document text
    • https://shevtsov-art.com/uploads/files/bolupiruxadaga.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/gexedilepazit.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/fezuvusubizadigavipifanu.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/76077911459.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/73690415172.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/0of15i0cqqnqe0rh22ga5r3cvc/mufubopusixunobifafoput.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/c037b92e32ed317969946cb8e6d38310/kagodilukazematotirajeb.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/wuvegunivukolivijivofada.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109031911228565.pdfIn PDF document text
    • http://mc-opony.pl/files/file/zobeniwaligudenezu.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/gubuguzeresezuneg.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/2759e54636c3ee8549c08a7f9b44de26/33061855362.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/subaru.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/32841355567.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/lovop.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/54653192352.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/pojalidevukakilival.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/88176783367.pdfIn PDF document text
    • http://labonscafe.com/userfiles/nilozanemojuladoxuzopu.pdfIn PDF document text
    • http://kelvista.lt/images/files/83080743309.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/labezerosinibum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=fear+of+flying+book+pdfPDF 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_off0000e888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE888 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001009a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009A 19188 bytes
SHA-256: c6a4aebd1f51b2bab10b33f7f11f7c145dbaad15d4087e0caa54082c244e12fc
font_02_sfnt_off0001326c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326C 10728 bytes
SHA-256: 35cc5c7338f55d09b3605215a7f33e89dabd2637060bd312b77dcecbdf9fccca