Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f6119716d68f1d2…

MALICIOUS

PDF

100.9 KB Created: 2021-09-09 13:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a8d14d5875fa4b59c3866a52a54ea46 SHA-1: 8b9ade32e87da037df825602bfa0c794ab4ad5b7 SHA-256: 6f6119716d68f1d27cb562554b3a1a2ee20c8539c2c4b9706846631988266c44
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing sites or download further payloads. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://drafthe.ru/uplcv?utm_term=hayloft+roblox+id
    • http://yuanda-boiler.com/d/files/20629179973.pdf
    • http://indigobaby.eu/upload/files/17478062635.pdf
    • http://vatlieubaooncachnhiet.com/userfiles/file/mobojelemivodologod.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/03f05858a045888432d7fb26f29417b4/xomawufedanidetakotir.pdf
    • https://szelvedojavitasmiskolc.hu/files/files/51948920589.pdf
    • http://aligokdemir.com/resimler/files/21094013427.pdf
    • https://gjbuyerbroker.com/userfiles/file/94179317636.pdf
    • http://aisne.proximeo.com/ckfinder/userfiles/files/87666376757.pdf
    • http://factblogs.com/uploaded_files/userfiles/files/letetikikejabenix.pdf
    • https://tekmaker.com/upload/files/budawesugeba.pdf
    • https://chokysitohang.com/Uploads/userfiles/files/tatidam.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/9052f5ca40811800fca3a1c145ecd47c/77445342625.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/161303ed4d04a6---jetenore.pdf
    • http://www.leasebridge.com/CKUPimg/files/12707911036.pdf
    • https://tch.lu/files/files/10573109140.pdf
    • https://daulte.ch/ckfinder/userfiles/files/xerisuforo.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cd48d4269---22156265072.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130ae90763d6---91215181419.pdf
    • https://parc-hotel.info/file/71861903270.pdf
    • http://guides2alpes.fr/uploads/file/nuribewofejir.pdf
    • http://sunmoon-glory.com/web/upload/files/xilavuvawamugudoxatoso.pdf
    • http://www.mezmat.ru/ckfinder/userfiles/files/pujaronowofageru.pdf
    • https://valleyrentals.com/userfiles/file/ratodiwisuxabunufovomaza.pdf
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/16418837618.pdf
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210905012255101279dg8fw4.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_off00011c00.bin
aee74745d6fc1084ecd64576203f77fbe8ca672c64e66bad2ccdb9c3ee0fc770
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C00 10292 bytes
font_01_sfnt_off00013348.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13348 16792 bytes
font_02_sfnt_off00014b5a.bin
9d3e230a60d58e151d4d25927f5f20b27896fc8552d2ab4573a7631c15d018aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B5A 22348 bytes