Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b813df849227bc0…

MALICIOUS

PDF

173.5 KB Created: 2021-09-05 00:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b9d8f9eb6fbc3bb3cd0607b6c93c64c8 SHA-1: cf5c75d46feddaeca6193a3b8a6438011e949d89 SHA-256: 3b813df849227bc03db45bc0024529d2d8069588d81498675d059dc53238407a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and link farm heuristics strongly suggest it's used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad013790852---melasawukarujimor.pdf In PDF document text
    • https://mecaniquekd.ca/upload/file/bigomukukilifenorodemilon.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/88629975241.pdfIn PDF document text
    • http://moristas.com/userfiles/files/10581439873.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d4e567f57---99451778230.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/9914834851.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a52fda527b8---xezaweru.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a9826a92f---ramopobatedovanunikek.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a440a6a63d---mijefepidunogeguvopoximud.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/burozadorumo.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/a6d474ce0c6431862eb9bcf1941b1b83/dotilagofekezaza.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/26786389723.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/kufedaduk.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/75309619865.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/lerisurewuweru.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109040305425391.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/34830063494.pdfIn PDF document text
    • https://campermagazine.tv/public/file/49861713693.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/lebuwekudisuwavogir.pdfIn PDF document text
    • http://melinterior.ru/userfiles/files/11769127893.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/63340650736.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/soruxoz.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/48289802887.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/74619470087.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/71469127677.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=manual+do+usuario+epson+l4160PDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000240d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x240D5 10800 bytes
SHA-256: 4b12fbd1651e75bf349b0c1478ecfbeabb3d17d09a68f38baa4d36e1e68aeeb2
font_01_sfnt_off000259d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x259D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000271e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x271E7 20736 bytes
SHA-256: 55712b757f3a2b097d45e2045ef82a76d5d82409ab332ca1e096903f36583afd

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