Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d252adf6ee38bd6…

MALICIOUS

PDF

85.6 KB Created: 2021-07-17 15:35:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ab35978ff562df46ca618ff6278a8545 SHA-1: c0eeea27df85a4b6cd5c3ffbc348267253590385 SHA-256: 8d252adf6ee38bd65efd155e5bea0437441d5e6327677fa60cfc64684913f005
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • 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://kingsfinancialconsulting.com/userfiles/file/gadurexep.pdf In PDF document text
    • https://aimhc.com/userfiles/file/divejimepike.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/o2jfegqvcq13hjptrb7vhaufb2/29189943300.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b46a4b17d1c---pudibimolezukag.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16087ebf11d421---52092490240.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078360dd6c3e---93721914375.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/51106789294.pdfIn PDF document text
    • http://imi.vc/upload/files/4926837334.pdfIn PDF document text
    • http://teplospectr.ru/images/files/2680964450.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/waxoxunuvelulij.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/xamonaxiwiworamara.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/68753723646.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/19012861906.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/dirumogogudixalevibem.pdfIn PDF document text
    • http://www.christianhouseshare.com.au/ckfinder/userfiles/files/6391423455.pdfIn PDF document text
    • http://kino-cosmic.ru/sadm_files/tumetelumiwolifewobazema.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/kpogbia502bpv5q4kjhvadkcd9/29407306395.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/073d6b1319da35060f08e70ef7edde41/gorugufujavagujajo.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/44869667325.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/ej5dhru0qlhfua05jqnpvl8cm3/64152548996.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/16577448841.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/1ce9b4a3ab26c3cecfad6f7e8740509b/karegefeworiko.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/bcd91e52ed6f008b75bff9157fce5750/85583649392.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=bad+manners+good+mannersPDF 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_off0000f021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF021 16664 bytes
SHA-256: eb34a8e5f808a2f038c0f64fb5aad828653aa9ba1b03964fa27983c6442ecb68
font_01_sfnt_off00011ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD1 10408 bytes
SHA-256: 42f76bb04fcdb2aabdcbf5d31a9bf5a6c4d1c9587928d23a5c8caf57b3bf72eb
font_02_sfnt_off00013221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13221 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1