Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e87d624d4f47df7…

MALICIOUS

PDF

80.4 KB Created: 2021-09-12 18:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9778b2509e6a21cb66adf402ca0c82e7 SHA-1: 4932cda6cb70a7b99859e69b104dea4d0e0d6d67 SHA-256: 5e87d624d4f47df7e7fe6020e3d13eaf69bf5738ad41671bc26aed5b1a76c63e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware download sites. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/7ee49ea2e1438f8d6f91866d365f1995/gosafovorib.pdf In PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/93819405898.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/kozelagoretasuzobibet.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/fc96b7f043b63225b9d5ac43f599dfe0/20055839259.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/faxiluromixenaxumoxiroge.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/muvudeberukaretemetedomal.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/tebatafitawivarukasuz.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/dirolupuxatulep.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/wefurekusuxever.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/keguwimemadokumopo.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d86d2af408---32752545149.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/lidofowe.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/44441036653.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/zesekulikogumijewavadexat.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210902010408.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/kafusufeso.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/79477876497.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/99483202556.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/90923967311.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/90418801013.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/winivoritolinu.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/87316828390.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/vanofawuji.pdfIn PDF document text
    • https://tcremich.lu/files/files/71852645570.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zirawi.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/22378436377.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=big+stan+torrentPDF 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_off0000cf17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF17 19828 bytes
SHA-256: f3cbfe7f9f4c9972009d9264cfbc27d5a8dacbf24e5157029d3bc1e49cd97960
font_01_sfnt_off00010319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10319 10292 bytes
SHA-256: 84ed6485bdf53467f3a9eb92c9f9c02ef03d581d7637c9df8ce1f49997f939ef
font_02_sfnt_off00011a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1