Malicious PDF — malware analysis report

Static analysis result for SHA-256 a40531c4a9d9bca4…

MALICIOUS

PDF

87.1 KB Created: 2021-08-21 17:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e884c6fda3f17c66521cea4bf5864856 SHA-1: d50d1b8f2efadff20138b9638f19ceca8890ed32 SHA-256: a40531c4a9d9bca4cd81f1f1f271966c67592eacd374e5fc3aeaa1aeff7d359d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS upload directories, indicating a link farm designed to host and distribute malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://decorstore.eu/upload/file/vikasotomekamux.pdf In PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d2187dc06---fufezifejifunufovurafo.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/mupadirobuwi.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cebeb6c8ff---79393948485.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3c10c2d53ee460b999a611db60f2b43c/kiludowujevorabo.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117eacb12d78---5183607653.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/xonawoxalunivim.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160789d7dd54a6---tedubutosuronogax.pdfIn PDF document text
    • http://stillwaterponies83.com/clients/74660/File/90675725593.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbe898042a---60575193402.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/voronojadedurazufa.pdfIn PDF document text
    • http://jn-zhsc.com/upload/53448195610.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a64f674a9---bidexutuwabawekigoxek.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/gubada.pdfIn PDF document text
    • http://tcihk.com/userfiles/kebobimukirig.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/r70nd22460u2u658vsavbqmr2p/90813277038.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/4728359064.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/aqsprgi64mhb5jle17nori9j1m/47931678164.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/5bfdd341ecbd650e978515e2ddd48dae/laxubuzaforerejixuxuw.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160917d55b2955---dimijujixeradesoguzerubo.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/62452739278.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/49813335135.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=nba+2k20+downloading+game+updates+stuck+at+0+xboxPDF 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_off0000ed00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED00 17676 bytes
SHA-256: 8c20cdb61717b0e888a2781cfe042e483c2e2ed42d42b56ceed0c754fd8b3d7a
font_01_sfnt_off00011b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3E 11496 bytes
SHA-256: 6c649be025098e0f58310e8c7b665530b043e7598b788354e64bd5c2529f17d3
font_02_sfnt_off0001362f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1362F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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