Malicious PDF — malware analysis report

Static analysis result for SHA-256 be866043dfba5d8c…

MALICIOUS

PDF

100.5 KB Created: 2021-09-05 08:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a25ca0ea9cf637d0c3cfe61594d8b769 SHA-1: 368f8125b46f165ee919dee0ffdf3d4b2fba27b2 SHA-256: be866043dfba5d8c4734cf57cc2e15d8f1bf460d1239067dbe2f73c530b987d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to mislead users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://cructi.ru/uplcv?utm_term=sql+injection+tutorial+pdf+download PDF link annotation
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/a892105beab029776ee98eaf2153c23b/xukuzajape.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/betidonul.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/3591269120.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/58194239544.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/f7574554dfa847ce36eb140c7fb4de36/diwefiwoxopelitu.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/zadud.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/712defd67cce71c221b2cab16aa34989/7801209858.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/28254642958.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/1e355e9be33d8e49d687ef7052b83325/lizuxuzojosajebozak.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/74772558702.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/zajupibutapesezivebuvaza.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/48716190123.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd6898310b---75373722977.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/57634660811.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/19428993082.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/87205190981.pdfIn PDF document text
    • http://www.moyekolodin.com/files/tuferatovanogunidawirala.pdfIn PDF document text
    • http://saxonsaxtonfamilyreunion.com/clients/f/f6/f6d0431f970e0833b0867c311dafb132/File/kimixunijewibenijaripesi.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/52560956654.pdfIn PDF document text
    • http://khanaphatgroup.com/UserFiles/file/43715868080.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/r8amm9at9t8lbjdf7lj3dncpbs/56517741787.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05df613976---vitewuxozefodo.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/wumidopufixupot.pdfIn PDF document text
    • 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_off00011ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000136ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136CE 19632 bytes
SHA-256: cce36ad12a94efd44913c5800efcc47583b7df22f8a5ff63cd0ce2eeae73b9ec
font_02_sfnt_off00016aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ACA 10980 bytes
SHA-256: ac3bce34a3bc9740ffb71c6b251ab5fe7f91d38dea0fcbcd324d0dcc2850845e

Open this report in the interactive analyzer, or submit your own file for analysis.