Malicious PDF — malware analysis report

Static analysis result for SHA-256 c99a36800a2d01b9…

MALICIOUS

PDF

83.0 KB Created: 2021-07-06 11:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b271b98c6fea3237a166e01ccefe92d4 SHA-1: 7459e130de3f8f9a4b9a93202ac98aed85fdb217 SHA-256: c99a36800a2d01b9b439f11b3411559d1856179b438846a3a93bf8fe14d7014a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm that points to numerous URLs, many hosted on compromised WordPress sites or disposable domains. These links are likely intended to redirect the user to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.deopendeur.org/imgUser/file/nivazarevaj.pdf In PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/12790335976.pdfIn PDF document text
    • http://cy2hand.com/userfiles/fowesidimasefaluko.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/25653070009.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/66648412309.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/luwisotozal.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/pulumuxezosafudilexulesad.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/zetexukodenez.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210630140601273795.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607def4dbc5bd---79891113696.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b645df9252f---worezogegezunewakaw.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/1aa347d380202f6ac99f926bfd3f42ab/kasaje.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/mofax.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/16976465537.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/13040619167.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/qt10nmgpoo91h1bs8k1oab87lb/gadirede.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e651d9f21---32934560485.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/79bafdcd48adcfaf39d5bfb1c751daf3/79862686694.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/hsacohshmk80l098jv600ad8m5/kotatekidilorim.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/favavakufasalufane.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/goditiwajopalexefazikajur.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607690bd11ee4---83895537364.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/98441510393.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=git+how+to+push+new+branchPDF 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_off0000df62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF62 17856 bytes
SHA-256: 566ce391b40d3428dae523e728e06fb7d300bde368f7469dcbd386a90ff9ef43
font_01_sfnt_off00010e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1B 10788 bytes
SHA-256: 455e0764ddb8cbe36f2f7805e7bd02afc24456e25793521bfc6f3cba81651c12
font_02_sfnt_off000126d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1