Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e37de25f2da7e6d…

MALICIOUS

PDF

100.8 KB Created: 2021-09-06 16:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d4d8e8b7310f816805215743aa70b3c SHA-1: a5ac8d37fdb640d8e9f58aca73b083d1717b2232 SHA-256: 9e37de25f2da7e6d029cbbdef7e5dd04b97b6fac6cb1c15d2d8ce74aee710faa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm designed to lure users to malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://irlanc.ru/uplcv?utm_term=autodesk+cfd+tutorial+for+beginners+pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/7d38cd2961d8d68aa50d679a5502af28/doguda.pdf
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sibalexexewisobofetigosed.pdf
    • http://mmbc.cz/_data/user_files/file/kupekogara.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/d00afa29b040e9d570c4d3b11b7cdcf0/59918782910.pdf
    • http://opersan.com/file/68890376990.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/mvi8fjt8ic509eljd2kun3jvmp/72652141293.pdf
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/98906680285.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/fa96df34bb191dfd185f4c3dd93361b4/vegapozanuxipuragekowexa.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112fc5168388---37353167369.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16103ddc1b6656---6082702772.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/49fd2c39908c3d635f75af2f1cb6e26b/25613901144.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f599e85ab05---28570555892.pdf
    • http://canxetaianhduc.com/images/file/54729997906.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d07401e5e---78335807870.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088a20bbd0ac---13038177120.pdf
    • http://nhhs78.org/clients/63854/File/wevunopaxefipi.pdf
    • http://afgventuregroup.com/cfiles/file/73011029323.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/371cef0055eb8d2d51f42309e8f74995/vejirorofiwagazu.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d7c77ff68---fufedafaw.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/fdf612e11642c328cbda631825ee2209/xulozozilefufaxerotazikox.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1879b9624---mivadi.pdf
    • http://georgekoldun.com/var/upload/file/jofobogevamitowew.pdf
    • http://nhuaduongnhapkhauaz.org/upload/files/7103928511.pdf
    • https://zifu-tech.com/app/webroot/userfiles/files/ridiketiwolup.pdf
    • https://alarouba.com/ckfinder/userfiles/files/sabusebibawumeganexalod.pdf
    • https://ntc-container.com/upload/files/zufofunujotubev.pdf
    • 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_off00011bd2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD2 16792 bytes
font_01_sfnt_off000133e4.bin
e6c0e3d259868f8b06b022bed2af8810863fcd892f4514fc7b8dc9044256c455
pdf-font-stream PDF embedded font (sfnt) at offset 0x133E4 21108 bytes
font_02_sfnt_off00016b03.bin
531f2566a80dd9f14ffcc70bfdc325983e9974cf5137d1ae9dff551971eb4097
pdf-font-stream PDF embedded font (sfnt) at offset 0x16B03 11108 bytes