Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d28c4b43d94b34e…

MALICIOUS

PDF

86.7 KB Created: 2021-08-16 15:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e34fa609f502a0e7bdf723bf7b389cd0 SHA-1: ad05d5c01fcc928cb833f3b705a5e40b91c8abfd SHA-256: 4d28c4b43d94b34e8b78b6374e9a608052c815c62c9da3ba8c3672d3af44c4b9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160717fa9100b6---vugozenoxolubapita.pdf In PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/rejuzuwirake.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/9997536930.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/gi65u35ad5irplrhcvc5tuii9q/78154368459.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/54019356735.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/vozugokanufapimu.pdfIn PDF document text
    • http://hkalc.com/userfiles/71120779519.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160977d9d02e4c---gokimijomigujisesepavewu.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/diwokuwil.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/jilisavixa.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a92a3a6e7c5---wukavajubemidefotame.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c3288da4592---nepidijoxekosesa.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/kizoguk.pdfIn PDF document text
    • https://mgc.to/sites//web/upload/files/wewazutiposatawosabe.pdfIn PDF document text
    • http://mramus.com/fck/imagesfile/birilafosutu.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc723965492---bolejufujokezinegeponov.pdfIn PDF document text
    • https://eurotechcorp.vn/admin/webroot/upload/image/files/38125089315.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/rebakola.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87311889776.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070964de1950---21081537281.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/nupexirutobetufozojapi.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/74081636308.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/cde052340a2c6632ba346971b0c4f30e/71295766173.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/67362637166.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=phool+bane+angaray+full+movie+video+songsPDF 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_off0000e6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F7 11124 bytes
SHA-256: 961b5a150c2066432b9cd7626daa1cf87619707c28b37212041e4434bb1df34f
font_01_sfnt_off00010085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10085 19992 bytes
SHA-256: a44d063feb0d356dd599e44c6c2e6869451430a3c8902662dc0a0b5ceea0ee9b
font_02_sfnt_off000133f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1