Malicious PDF — malware analysis report

Static analysis result for SHA-256 798d0b7ca21305c6…

MALICIOUS

PDF

96.0 KB Created: 2021-09-03 21:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5e1026d206e3a6d1bbe5e26a2b10ab7a SHA-1: d5d5719330c2a1b5a127a89231587dd59bb4385a SHA-256: 798d0b7ca21305c61f800548b054892e447594360d388c594896626c7afc1ca3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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://pixomot.ru/uplcv?utm_term=ac+3+phase+induction+motor+mcq+pdf PDF link annotation
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/r7jnpmmgeukm68fblk8ubibvq4/wepobivikosuxixasore.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161130623ea41d---3356963913.pdfIn PDF document text
    • http://szpk.hu/_user/file/kivezevini.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e9bd881d17ab6cd5c1d3aca40aa2beaa/bexaso.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/871525386.pdfIn PDF document text
    • http://monroehighwildcats.com/clients/40160/File/51042833624.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/lrt5pmg9lnsav128rtt12dv024/55811657394.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a08bf658992---14609512412.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/sugisotiwiwojevosi.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611e777817b37---13806287364.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2dbc181b7---bozapigoserokatulol.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/26603001265.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/pixevegupomiledefokapar.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cf7c72914---rojofovalopodi.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/80070771117.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccb6f2f121---woferosigaj.pdfIn PDF document text
    • https://coevent.ru/upload/files/4779253543.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/85936459738.pdfIn PDF document text
    • http://rts-3.ru/upload/files/solonered.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/g65vaoatrjq6alam54bjf1h51q/didiberudetagupa.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f8d4de3bd---21341406282.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/nizugeturaputumuduwobupu.pdfIn PDF document text
    • http://alwaysfavorentertainment.com/clients/879371/File/ruxabimowaj.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/zilasidez.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/sunetujolejuduxek.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_off0001115c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115C 11240 bytes
SHA-256: 258361f59240c1b4a3df06db5427826f4d6fbaf1552e9fa632c27a03700129bf
font_01_sfnt_off00012b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14374 18040 bytes
SHA-256: ef6f2f6083a5fdbc9e98c6c0b7bde1b557e9aed47d9a00d2129c17ada835ef53

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