Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fe3df1313c84192…

MALICIOUS

PDF

100.0 KB Created: 2021-09-06 22:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 616ade8cdb706b1e9136f8dcf9409936 SHA-1: 180b6c54e1ecbaafd1df5feaa1cab2c3d780bcce SHA-256: 2fe3df1313c841924eaa92d9a0e28007f96ff17bced9c6db6aa5e6013fa5b669
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 https://euroroma-bg.org/files/file/badoxofekorew.pdf
    • http://catherine-massage.com/ckfinder/userfiles/files/debapanofi.pdf
    • http://tlumacz-lipno.pl/pdrzewiecki/files/60155511820.pdf
    • https://arichaindia.com/userfiles/file/95650719963.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160e108ddb0694---1819953356.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/2050dfcc3df6a3cbb55761f836762866/regefifomef.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/8aj1mqsbk12eo44icd3a7vsipd/78325246780.pdf
    • https://muzpony.de/obrazki/file/retaximikonuwimaba.pdf
    • http://mim2010.ru/userfiles/file/59468360012.pdf
    • https://anandamsanyal.com/userfiles/file/paralidowuxigofaxem.pdf
    • http://fioredda.com/userfiles/files/35405214222.pdf
    • http://aliceinformaticasrl.com/user/pages/pamadakupami.pdf
    • https://sibservis.com/ckfinder/userfiles/files/86798511832.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ad550d24d5a---mipimitetufevukobamajel.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/1fd768588dd81af5ad85d7bd5d59c278/93817223253.pdf
    • http://gazetavk.ru/img/file/numudijusobugek.pdf
    • http://geriatriccarenewjersey.com/userfiles/files/52209542066.pdf
    • https://medsplus.us/admin/images/file/muvuxopalifijudemexipedel.pdf
    • https://b2cexpressdemo.com/userfiles/file/vavaxojus.pdf
    • http://sibmetiz.ru/upload_picture/14667681473.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/5074b454af41a43595d8a82cb2e4c832/jerigivofil.pdf
    • https://vleek.com/uploads/files/10099953495.pdf
    • http://kimtuong.vn/isc/public/files/fckupload/file/namonivufuxikowimuvere.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b3607313da---safesavudesewa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=knowledge+representation+in+artificial+intelligence+tutorial+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_off00012021.bin
09d16198566bac787a1bb0976457c8dcc062a15bab940dc4a5637e87284f3325
pdf-font-stream PDF embedded font (sfnt) at offset 0x12021 10972 bytes
font_01_sfnt_off00013992.bin
b2253cbc8b094533d5c767d0ff1679b2fc47ec5acae99e9d6c07a4433e934dcc
pdf-font-stream PDF embedded font (sfnt) at offset 0x13992 18560 bytes
font_02_sfnt_off000169f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x169F2 16792 bytes