Malicious PDF — malware analysis report

Static analysis result for SHA-256 02b4640b6f1c795e…

MALICIOUS

PDF

74.1 KB Created: 2021-06-22 21:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af756a2d5f4728ab7b88ea6f3954c35c SHA-1: 2f9167b9ee11510aad7ca117ee3714e850112f27 SHA-256: 02b4640b6f1c795e7f0eb89f0646c0c0f42b30ece17ea8140d40cdbe37b4ce78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file is detected as malicious by ML classifiers and ClamAV, indicating a phishing and trojan threat. It contains numerous links to compromised WordPress sites, suggesting it's part of a link farm designed to distribute malware or lead users to phishing pages. The document body, though heavily obfuscated, appears to be a lure for 'business studies grade 10 notes pdf', aiming to trick users into downloading the malicious file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://garglob.ru/uplcv?utm_term=business+studies+grade+10+notes+pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/fae22e54ee2fdbdf0276c3e5727fdb61/zevavobupul.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/0819k8t297e4o47jfisn9p6u9s/bavasewubu.pdf
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/it62g6569fe89bsi4kvfsikvdo/tanesuritake.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b90165d4ed3---92850562742.pdf
    • http://oresteruggiero.com/userfiles/files/zutekotuloxalaviwowadaj.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/lmbnjum4akbn9m75g1slp3ual4/podefajuje.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/e0003caa6ac22f07b327d77e660536a6/kejibetuna.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b918d08076---nadededew.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783e9ece89b---wisiwirovum.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b293421f75e---texupaxe.pdf
    • http://zae.me/datafiles/file/dukunawi.pdf
    • https://ancoraeducacion.com/images/jemodunipipuven.pdf
    • https://alatheir.com/atheirwsfiles/file/xapel.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608893cb6c473---zegubad.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/167972809887dd6fc62918e640f76379/97865786185.pdf
    • https://colakcivi.com/userfiles/file/80339730815.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/02983ef043bfb3d8b24bfb294bf6e161/3755648368.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1606c837ee2a6c---10040710634.pdf
    • https://shibbirs.com/media/files/77146205311.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f32a959c26---70387702685.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2fa.bin
30584f40988dbc3d93f257c4f5426cc0af9c1a064140dc087d746f019d1bde80
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FA 5420 bytes
font_01_sfnt_off0000f57f.bin
f1da5c070c801373bf5be3b9efc9e06875a2561400941c654ca4a77a1f221660
pdf-font-stream PDF embedded font (sfnt) at offset 0xF57F 10532 bytes