Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f943c6e4e5ac40…

MALICIOUS

PDF

71.3 KB Created: 2021-09-01 18:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7186024f3d1c774cf7a2e1a6ee23de06 SHA-1: 5d91f17fa4a2fe443bbacc06656ad38204668195 SHA-256: 15f943c6e4e5ac402463aef68105f2888c095d0614a14cd3d7a41a3affbcbfd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs and link farm indicators suggest the document is designed to redirect users to potentially malicious websites, likely for phishing or malware distribution. The authoring application 'wkhtmltopdf' is not inherently malicious but can be used to generate documents for various purposes, including malicious ones.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pixomot.ru/uplcv?utm_term=popular+old+hymns PDF link annotation
    • http://www.verneteco.com/ckfinder/userfiles/files/50358378213.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/pogefogepokozi.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/e7a86ea33bf164c62165fb026f8b7c44/39679039087.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/tebovepuzamuv.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/nutefanikuzetuv.pdfIn PDF document text
    • https://slaterlighting.com/wp-content/plugins/super-forms/uploads/php/files/b67d10c40a6226e1862eab3f7ee045bb/lafepavizu.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/xubuwokupuvuwapatoseb.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210817204609.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/sv4k9m8fvnfukkk419bidgn232/11299024437.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/28545958290.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/dipedame.pdfIn PDF document text
    • http://enidbtwcreunion.com/clients/5/52/52e94d62e82ff66504c7d921fc07bf70/File/ketetizugapijumikafugizeg.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074dc2e8162c---69113871133.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/bixukidenasudizo.pdfIn PDF document text
    • https://eurotig.ro/file/43170722223.pdfIn PDF document text
    • https://indianpowerliftingfederation.com/userfiles/file/26949496234.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210815030123.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609b091114fc5---65246871751.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a36c67ad838---rajis.pdfIn PDF document text
    • http://timebymtm.com/upload/files/32518085247.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/nofezen.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/98865409012.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077cad2bdaa0---molelifofixaruwekexurok.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_off0000b8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8AE 10548 bytes
SHA-256: 143f4a14dfdb889e9ba88aa7c09192c1a4b2f9f11d30ce7293dbf7f5ec6bc101
font_01_sfnt_off0000d08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A1 15304 bytes
SHA-256: 03ddaa97b39dee0806a86d79ec775312e692971a7f83d450e3db3a7f82468f3b

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