Malicious PDF — malware analysis report

Static analysis result for SHA-256 b299303a92d7082a…

MALICIOUS

PDF

76.7 KB Created: 2021-06-19 11:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: f0daffcc77c43c387a84b990a7fc107c SHA-1: f29ae8db6b9d27c29e317ec7ab5af5434af94e24 SHA-256: b299303a92d7082aebd1a192f9451db1a0506dfe8a5743856aa92420cb611d14
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely contains an exploit. The document's content and embedded URLs suggest it is part of a phishing campaign, masquerading as an answer key to lure victims. The presence of multiple links to compromised CMS uploads and disposable hosting further supports a malicious intent, likely to redirect users to a payload download or phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/qrua8tuka2grk3oovpmch8n8j0/6898274820.pdf In PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/golupigarexojujin.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/34d4f1dea759fb2b487539b0b3d9bfde/bobudozapidegegoxe.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/0dka0mjgi3vejff5ic2nd2jfd5/wijowod.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/4784c61ee4d09ad92316eb19755fa866/zogepekemeluvasagesu.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/8j2gb6v5pv9v6q1mo0reckb586/nonibepamamuxa.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c7235cbad---77373439770.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7d4bd718d---tilonimizoxamesiwizumug.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bbff0330457---78274748371.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a615f2bd7d1---zofajojirosulaxukov.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070d4894776c---11149251869.pdfIn PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/somobiluvemosar.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4cbcc8c1a---64086591884.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/20391979241.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/34486885451.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/ebt0ohna89ro4lcr5f0f8l6cj5/49612434694.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=assigning+oxidation+numbers+worksheet+answer+keyPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAF 5664 bytes
SHA-256: 18b1b9bc3202ea45f27501d31042c8d16359757b80351a49ff3e0665c2620bdb
font_01_sfnt_off000100eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EB 10768 bytes
SHA-256: fcec4e75d4093567f5ab09507615f315f8cdf320a4b23bfdcce4fbfe021104ff