Malicious PDF — malware analysis report

Static analysis result for SHA-256 2952495bd28277e8…

MALICIOUS

PDF

85.0 KB Created: 2021-09-06 06:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 44844d84f2ae7a50c8221e594a660ab0 SHA-1: 84679a06df81821f64be065487ccbb5d58991d64 SHA-256: 2952495bd28277e8f6559045645ada23c8e0a5493061338e6e32aabf58fd9852
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to redirect users to malicious sites or download further payloads. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to compromised WordPress upload directories and disposable hosting. These elements suggest an attempt to distribute malware through deceptive links, likely initiated via a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mbjarrahi.com/UploadedFiles/New/file/tufujewoxobukosunemezi.pdf In PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/495da946aed4dd5bd59be355c03222f1/98064013641.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bb5bb4dc7c---xazekepezexilu.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/1b16a6e301a3f03d7706e543e13e3f52/xezaximurasarejeparimusi.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/cfs5lfmm400bluhf2shmre3o7b/zozisusuwifisibeziwu.pdfIn PDF document text
    • http://salt17.com/userfiles/files/pifinubezuvisapez.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611b1be8222cb---lafosulojoz.pdfIn PDF document text
    • http://huefpdf.org/upload/file/50158856236.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160f99aa278494---69633171590.pdfIn PDF document text
    • http://zionhillfirstbaptistchurch.com/clients/73368/File/48399945606.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9f9258724---51706644795.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/66625929209.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c09d894f2e9---zenezinuxo.pdfIn PDF document text
    • https://tpk-m.ru/files/file/50633697040.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/f20453271181d3a60b7b35f9c507887a/gaselafowixilev.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/18534469418.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1608cdd6b0a4f6---41866549273.pdfIn PDF document text
    • https://werbemittelag.ch/upload/file/17201768014.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/gokolivumoxanop.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d79055e0b---kimefopatu.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///dujajalunivazuwa.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/wavalerexerejejaxebu.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/duir0er26e01leabsqhcgspf04/18951101308.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/88935087073.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/uv0kv916sc0k77uhiiqtf9h1ki/benifegokixorenunumuviju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=power+book+pdf+downloadPDF 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_off0000e8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E2 10452 bytes
SHA-256: d986042cd5dab8530b49e8d3a345abc09ecc24b32488a669018be98c5d701d9d
font_01_sfnt_off00010092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10092 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A4 17812 bytes
SHA-256: a9ee5d01495630848b2f17ba78cf40f57b8aec24d79810b96d2f999c9cd7df1d