Malicious PDF — malware analysis report

Static analysis result for SHA-256 54d759b0bba2174d…

MALICIOUS

PDF

91.0 KB Created: 2021-09-04 01:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3cde2b53a1b5f2fe957539df6ce23453 SHA-1: dbc83ae81957515b647d43ac81375523f03a2064 SHA-256: 54d759b0bba2174d08dbc16a1edd30ae326845ba92fc1f5f83baf4094a00b7b6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm for SEO manipulation or malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://stalmost.pl/userfiles/file/23608020423.pdf In PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/zalazajexalajoxodubisux.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/65064331285.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160794cda87e1c---sedikitugawafetapuper.pdfIn PDF document text
    • http://samtekelektrik.com/files/zematuzekivega.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/tonebul.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/tunenubevizovoba.pdfIn PDF document text
    • https://marigabung.com/contents//files/rifalif.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b106dd835f0---57758309095.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/2mk8o1o5dsa97m3mgoo65jmenn/25508415000.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16088c227ce679---8235454864.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ebef8e40e---kafexuvuduvugagixisavif.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/robozewinaxeza.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dabba2cadf---noxajelowurekubelunajo.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f051c44f7---93362880287.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/6639196020.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/xulogerej.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e04658903---81644551470.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/64770478771.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/vewoxusiran.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210816_56FB50BF5332EDE5.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/mijutazisejuxo.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/15360247421.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c268f056678---72390028786.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=applications+of+laser+in+medical+field+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_off0000fe64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE64 17764 bytes
SHA-256: 4318c1f603d7ae1ac6aca94f68ca5de98831f38c1655a758cb2187e1ab9d5f1c
font_01_sfnt_off00012cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF5 10760 bytes
SHA-256: ce9fd0ffd2dd8f70d40ade20a5260112873637ba2af7f7d993153dbc50179b85
font_02_sfnt_off000145c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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