Malicious PDF — malware analysis report

Static analysis result for SHA-256 c29ddf9840983fbe…

MALICIOUS

PDF

85.4 KB Created: 2021-09-04 07:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 622bbd81f20a0703508e49915662b780 SHA-1: 6099d059e649474e875c710d4c572a4412685891 SHA-256: c29ddf9840983fbe7b6a374386ea8b111e302777bbe728765974a54ad50f88fa
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for human readability but rather as a container for these malicious links.

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://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/0e90eb47ae1bfb896a54f2012d2c49aa/ziwejewuvag.pdf In PDF document text
    • https://addsfly.com/userfiles/file/janij.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/zamiramijigadilatuwu.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160fda915ded85---91044159111.pdfIn PDF document text
    • http://hawkins-kearney.com/clients/f/fa/fa1934e8f236f3272fb98c88546bd003/File/wunazasepuvixipasokezifed.pdfIn PDF document text
    • http://suapaiatuipelehakefamily.com/clients/80707/File/74941797529.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086bab9d0036---47686784655.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/zalidarimirudiruvi.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/jigoxapa.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907d942705d---dinefepam.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-4-30/20210430174719277318.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c2434dde7d3---butagexebosijopagibije.pdfIn PDF document text
    • https://intellicapital.in/ckfinder/userfiles/files/guxanapa.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210621_1F4D932D0714765D.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a094dfc0c6f---36154567515.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea6f95db02---18885962356.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/c214046pk726ormg46dlmm9b9e/mewusasomujur.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/d9602452f8e10271ad71e69cabc35289/22955777879.pdfIn PDF document text
    • https://tonycustomtailoring.com/nbloom/fckuploads/file/88914298715.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/6a0979c267342b6ea23d7dd8dd3129ac/rugaronesiduvepavilosujo.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b05ec8a3eb2---87118827904.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210904041455.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/nimula.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/2bf93c74f5d0238162e057f303f72ae4/98365476750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=flecainide+davis+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_off0000e9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B9 18144 bytes
SHA-256: 6334dcc1e825965fea092f7aed0888a2c316161cc3173ddd64f07d28d2835bba
font_01_sfnt_off000118b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B8 10340 bytes
SHA-256: 743c5d40094ff456ae15441b05ed389e2f3c6245235e3604e9f73850e9a99f61
font_02_sfnt_off0001301d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1301D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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