Malicious PDF — malware analysis report

Static analysis result for SHA-256 d66965b6e76057ea…

MALICIOUS

PDF

74.1 KB Created: 2021-09-02 16:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b0f0682ccec3d5c5064089e4ab6a31ef SHA-1: f7424b72b61f5a9fb40ee248b71b7c56579b0774 SHA-256: d66965b6e76057ea84cfaa7642808fdfaed788b09956260a7b7c849d7c304a78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates an attempt at SEO manipulation or tracking for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://garglob.ru/uplcv?utm_term=social+media+network+marketing+pdf PDF link annotation
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7b8fdee4f---donotomiginele.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/0fb322398ce3fabc6f7033cab6f23002/29200428818.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/fifoletam.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8fb910403---wegakojifilil.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/tuwux.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/rexamidujodubazomifufomu.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/48944859052.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3f129b0d7---38205626813.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f718b8a8c---zekuzuxekolesobabexux.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/3ie95udomdkgfk11n18s91tcq7/18587217276.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/112ace08ae48c8a62bac554f03d3cdc8/ruzeveronexajeze.pdfIn PDF document text
    • https://iohrp.org/f_files/files/buxidigoginukelafapitupuk.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609db70cb4de4---77275724657.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/lisukabowipipag.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/1c266768fefa01bcc6302928ded57535/bapiwezewobolas.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/movufufomiki.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d9c81ac05---fomikusuw.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16078f040b7f0d---26344660805.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/pinaputiziwetitunonulek.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/c4803e273854b3ef366a12fc9ec9b400/reneduwalitilowov.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/uc0lp9dkcf2kab00agg8bbbjb2/dozubimotoxi.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a761941f5---xagerete.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a834059c80c---26966009576.pdfIn PDF document text
    • http://rghsalumni.com/clients/82979/File/92936720991.pdfIn PDF document text
    • http://walkandwagforveterans.com/clients/9/96/96cc06f6b2a5429c1325f0b535cddba6/File/95714098672.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_off0000c29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC29C 15216 bytes
SHA-256: 6a4a202246860c46dd4c2bbd6870f4738999d69dda4aedcb3bf9e1e124d66225
font_01_sfnt_off0000e8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DE 11048 bytes
SHA-256: f531ce48eae134f9ac26a24d92ac5b139e536d6f90225cdff6df7d4ae507d68b
font_02_sfnt_off00010267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10267 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1