Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bdb0a35ff611baa…

MALICIOUS

PDF

72.3 KB Created: 2021-09-23 08:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: baee711c0a06a4fc2443650eac49191d SHA-1: 439530fe4231546fdc85109df222e28d34525c79 SHA-256: 4bdb0a35ff611baab8b3c946fa1e002b62df1b22f4dc3994be7426f2cf776be7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://huntic.ru/uplcv?utm_term=android+startup+app PDF link annotation
    • https://aneri12.cz/res/file/18819219022.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/83998200502.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/49600781401.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/64586360223.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/2c832f81ce1facebae69a1e4a878fc5d/70360001956.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131f185442cb---lalawixuzuxoverawexibo.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/nonefijarosemum.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/nuvafoxatoket.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/busikowezavadegamezijaj.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/rifopujemamokipojaxogur.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/24382152457.pdfIn PDF document text
    • http://spiregene.com/image/files/20210910_023147.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/b816861a0389a2199331d85ffcbc85f8/34338414763.pdfIn PDF document text
    • https://agatanorek.com/files/file/9158002035.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/52628162175.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/tokokopabubedaf.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/24915700865.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/96647667caec277479094b117642d702/77864371339.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/gojokajixugisekuli.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/pisazijotezuribewovoka.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/76183290964.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/86067777106.pdfIn PDF document text
    • http://asfalon.com/__files/file/32762378836.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/61566867639.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_off0000b836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB836 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04D 10288 bytes
SHA-256: e1558606756a09302f67a802394fa54c2d0d0ccbf08d30880d7e911395b6b850
font_02_sfnt_off0000e795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE795 17112 bytes
SHA-256: 4242ef93bfcb61d16803805b671813555a0f5e1ed353c801b104d8853238fba5

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