Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7b2c908b73a99a…

MALICIOUS

PDF

243.2 KB Created: 2021-07-27 13:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7c3f21b0eb53813c507b9f7fb6516ba3 SHA-1: 6fdf03e56a1bde3b4332b6a5459c77d1807b9907 SHA-256: ef7b2c908b73a99a812b2c02bf0b24b1bdbb55db35d3014f64224682f0e5795f
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a phishing or credential harvesting attempt. The primary attack vector is likely a malicious link embedded within the document, leading users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9565

Heuristics 5

  • 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.
  • 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://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/4ec1e895c3ba50f8fd5ab39c8130e41a/faxuj.pdf In PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e15c64589---petabemitexenazivibujozek.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/14306148550.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee8d13512f---sipezineg.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/obofl40p5ihmh8m9lgpk56nd3e/93383591355.pdfIn PDF document text
    • http://proxima-design.cz/files/file/newomomapevov.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e832ed8df67---setilatogonifure.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/dcd00a81d237a8e7a9cf0bdb7c866011/dojevubebulukizeniwik.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc576b2af4---lurosuwezepitanamalejev.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/86632451811.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/51518024628.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/25532335686.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/751aca3c443f49fc10576b3fa9f35592/72213052402.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f768e9afdd6---jinipepinekap.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/ad7e4d47544453451a8aa4ff849bed16/83089077497.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/49dd390e9e3ca380d3a1f9d6033c459e/85511884943.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/048b75f938841e75a9f28f0f67e6128d/mupopakilazujiza.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/206d3649cba9a0c997a22c009023764e/narepukon.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/nurowiwuxuj.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/lisamewavubetopi.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/6cc242ccc7ecb87dd97aa305df386b1b/12384078049.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/63bb9deffbcb4e6e25ac7c5ec4dec758/15950917983.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87744b5844---zusevu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aad6ed292fe---37335692679.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=proust+and+the+squid+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00033aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33AA2 10796 bytes
SHA-256: ec935c3485327c96874ca84fd5f8efd9805351330c0e68a0a70fd4a1de3f5c6a
font_01_sfnt_off00035338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35338 19976 bytes
SHA-256: 956057ad75da1bcdfc6e3920688e39f8fe3e95b7c8bb68260e9220bfd8f24dd0
font_02_sfnt_off0003866c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3866C 1756 bytes
SHA-256: 334bd374838866f92714fd365cafaf68d85d1d5018c1786c644a26d5d6250d02
font_03_sfnt_off00038ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x38EBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0003a6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3A6CF 16444 bytes
SHA-256: 8ae84c7b98dd32b1eeaea15851f305d19d653c1e20991e9a3877098ecb715807

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