Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ed650f8e913defc…

MALICIOUS

PDF

86.5 KB Created: 2021-09-02 21:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6063cf8982ed1cd8be7f1a3924f81eac SHA-1: cef9d09b0586e54fb47c2e06dd993e365e9186c2 SHA-256: 3ed650f8e913defc07b137eeea27c2b42527fec62f39fe30c51d664ea7ccea53
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of ClamAV detection and ML flagging further supports its malicious nature. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific intent beyond the presence of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087322f8283f---jovik.pdf In PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0563dbb32---bidepujosatog.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202108211737082211.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/jomoroperum.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d9bea8d4752---2916484952.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/tugurag.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160af60e8928d6---tazenolajorekax.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/cu21avkfgls1crjgfo7qcpm2cg/45153390399.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613105fc6fe6a---goxoriponezaxefemutewavap.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202108172031359135.pdfIn PDF document text
    • http://eva.am/files/69a8781d9d0f3924.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/788210c9166a35032059a352664b2d40/lojopo.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/hnmt6c2c9dtq5thl4a443k3gl3/73708354267.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/pinosinutux.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/67571e40afefaeceecdac7a749ad899b/44088068831.pdfIn PDF document text
    • http://raljob.com/userfiles/file/gefonovetifawikaziwiwemol.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/97879855417.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/af10e252f974814f347b6012157979b7/60744256506.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a93372ad70b---nanisabavizasinefazu.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/96230564932.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f273904d27---fitogena.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094170ebf3ff---5052983896.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=rangkuman+materi+biologi+sma+2019+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_off0000eb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB82 11680 bytes
SHA-256: 760aeda435a0048bb4296ec90756e1446b5dd914d4fb53e47f8a94cbe3e98e82
font_01_sfnt_off000106f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F08 17716 bytes
SHA-256: bb42e3bb62e0519dd8fb9232ec00c07d5e54137420087f32aa258c320bf2151b

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