Malicious PDF — malware analysis report

Static analysis result for SHA-256 136f0a49e4a9be91…

MALICIOUS

PDF

91.4 KB Created: 2021-07-31 14:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 91da6a31fe626e24d0d51b7cb6371111 SHA-1: 83239295d9be247adfcd57fdfc9f871df5f584eb SHA-256: 136f0a49e4a9be911a500e25466d82b6f5182aa2ce14923d9e9beedeff4bedc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm pointing to compromised WordPress sites and disposable hosting. The embedded URLs, despite some being marked as benign, suggest an attempt to redirect users to potentially malicious content. No scripts were extracted, but the PDF structure and numerous links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085b8e4297c6---rupanorugarumipebow.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082104854f96---lovunapegedizibi.pdf
    • http://fitviewer.biz/files/file/98147414253.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/f599b0718d6fd2537ec5e10c710a9380/44030888247.pdf
    • http://daeryuhealthcare.com/ckupload/files/42532749308.pdf
    • https://laptoptranganh.com/data/dulieu/files/34813773300.pdf
    • http://jshtextile.com/UserFiles/file///gapefaxulefekedosadogow.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba3f09eb5b---64642066934.pdf
    • http://elsekmont.eu/userfiles/file/xixivaxagiji.pdf
    • http://amadpich.com/userfiles/file/16868541501.pdf
    • https://avenue102.com/uploads/file/96905986155.pdf
    • http://wenxuezj.com/images/File/82954471424.pdf
    • http://acpiindia.com/userfiles/file/posopidulewifo.pdf
    • https://arhometutor.com/userfiles/file/pirideguraxolegajid.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/inn7r9s0nefc2ht7qc1cgg8a93/kigetito.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/dd407e21d491e890d083a033e8480b75/xapibatafatemizarumu.pdf
    • http://isystem.hu/ckfinder/userfiles/files/64388462510.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/f90d4c2ae48ecea80e9aaef432dacb49/94858336425.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/e38076e99d0b5203fc7ad2be0ef25178/mexisixebapevide.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/s6t6k6se8u61pgfg1s5f9nibbg/firib.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=%D0%B3%D0%B4%D0%B7+%D0%BF%D0%BE+%D0%B3%D0%B5%D0%BE%D0%B3%D1%80%D0%B0%D1%84%D0%B8%D0%B8+8+%D0%BA%D0%BB%D0%B0%D1%81%D1%81+%D0%BA%D0%BE%D0%BD%D1%82%D1%83%D1%80%D0%BD%D1%8B%D0%B5+%D0%BA%D0%B0%D1%80%D1%82%D1%8B+%D0%B2%D0%B5%D0%BD%D1%82%D0%B0%D0%BD%D0%B0-%D0%B3%D1%80%D0%B0%D1%84+2019
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef9d.bin
32401a3a7e2cfd911e99c9c0bc8612a0474444c90c7de1df5253225f8d80b249
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9D 22008 bytes
font_01_sfnt_off0001273d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1273D 16792 bytes
font_02_sfnt_off00013f54.bin
e11d4bed10fa2e8fed1ce7f09cbe3747f7cd12dd584a0987566eeac45639e491
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F54 11872 bytes