Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb16ee45dd35edc…

MALICIOUS

PDF

89.8 KB Created: 2021-09-04 10:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d5573a1a9c5edb00737c08db10c213a6 SHA-1: 7754b221f3930a2940bd33901f627e0381df0908 SHA-256: 4eb16ee45dd35edce023b69e4c76c379944273321b17c31e60f3970da1dd9e55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://playworkspartnership.ca/sites/default/files/file/gurobapikutuvo.pdf In PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/ca0ebb2d4466d664e162c2b04019f085/37313768366.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/rekaborunuzosulofegux.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/59006480564.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/d2401a967e8e7c9e78048da4eeca03c6/82493440507.pdfIn PDF document text
    • https://cape-electronics.com/media/file/92962652827.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/xakuzilaliputefazotubiro.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5c9812693---24677739942.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/60027358241.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/3769382647.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/97521380678.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/2642226712.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021052800143851.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/ba04131f35095ea26bc326b79a53a915/21255889224.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/giloxenunefobivirerexe.pdfIn PDF document text
    • http://artio.pl/files/files/66296876178.pdfIn PDF document text
    • http://parquessolaresdenavarra.com/userfiles/files/41682050087.pdfIn PDF document text
    • https://agermag.ro/mm/file/1027456398.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/rujuxabaw.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cc95b855c17---34291677594.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a29235d7937---62371118297.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e8bfb899850---3254923810.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/6597196701.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608df927bc6df---83740176896.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=fantastic+beasts+the+crimes+of+grindelwald+pdfPDF 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_off0000f6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FF 18372 bytes
SHA-256: 007c7250de74e53b9dd6397e109ee8e4041a40e794480a45766b465ffa2eb877
font_01_sfnt_off00012711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12711 11268 bytes
SHA-256: 7f96a91fab4d0c74a9e059d25f959ec991ecf5ffdf81c5bec20acfb70900604c
font_02_sfnt_off000140f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1