Malicious PDF — malware analysis report

Static analysis result for SHA-256 0856fb1b94630482…

MALICIOUS

PDF

84.3 KB Created: 2021-09-18 19:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 22163f7c1a47b8d8b63bbbd44813fd15 SHA-1: 8057f4d9003ab3e00b4b9bca22d0de6fadeb7fb6 SHA-256: 0856fb1b9463048221ba443493a86568737ab39e32f59afe8245bf7723a24651
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, with one URL specifically indicating a compromised WordPress upload storage. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

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 https://verner.lt/images/files/lomejovivibivavori.pdf
    • http://meskerjager.nl/media/files/1796314626.pdf
    • https://inarsindbari.org/uploads/mobezalufiwurivedadem.pdf
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/35267017890.pdf
    • https://stepweystudy.com/ckfinder/userfiles/files/78119246130.pdf
    • https://alpinashop.bg/files/44059331066.pdf
    • https://heritran.vn/uploads/news_file/sumonatilipanora.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/bbba30596fe93991f1cac2cfe2ce0575/kamosuwabozisulajaso.pdf
    • http://tylincms.com/userfiles/files/buwugofurisimukaloxonuvo.pdf
    • https://sindonis.com/userfiles/file/67801332375.pdf
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/zanepovojatej.pdf
    • http://currycornersugarland.com/admin/images/file/9914460606.pdf
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/susunedazitafetuminexu.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf1bb93f66---demakugekadojekawux.pdf
    • http://nataliashishkina.com/userfiles/file/43815623331.pdf
    • http://m-camper.ru/ckfinder/userfiles/files/67815147382.pdf
    • http://pantryscan.com/123cars/imagefck/file/28222294219.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/662250c3671a2355204799dd0eec8f29/36661070477.pdf
    • http://nexxstep.nl/userfiles/file/dumasukifajajolufi.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/3491817504ceb5e77f8a2732ebfb5cfd/pokolimidejejun.pdf
    • http://mn-print.ru/ckfinder/userfiles/files/pawezavapugijobobumufevu.pdf
    • http://aodaiminhhanh.com/app/webroot/uploads/files/vapagopeterif.pdf
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/xudiroturola.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1a2001330---62438070475.pdf
    • http://briztravel.com/upload/files/pajavitiboxefozulawom.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=umbrella+academy+watch+online+free
    • 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_off0000e37a.bin
d47811ae073dd4b43186ab18dd0bd7d726f9d713cecced8e05c0fa854f77141d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE37A 17920 bytes
font_01_sfnt_off00011232.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11232 16792 bytes
font_02_sfnt_off00012a49.bin
2c21b9493e48b81b940d2922bf4cbbd7019fdc36acf54fa3dc3da00a2ca02ccf
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A49 10920 bytes