Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d67c4a16760b72…

MALICIOUS

PDF

70.5 KB Created: 2021-09-07 20:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d3540cf30b601c6affe7d47bb84364ae SHA-1: b50f32f9672c01ff80df9faf029f124f71d7cb6f SHA-256: c5d67c4a16760b72de351c5b48e0e860db238b4dcaac0efc1c6e69688a485681
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. The presence of external URI heuristics and the overall structure point towards a phishing attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://nomylo.ru/uplcv?utm_term=definition+of+performance+in+education+pdf PDF link annotation
    • http://kaupa.cz/userfiles/file/84715770566.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee37de4b79---sujuxabifuxarin.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/52108797492.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/k93fugc3jm16ndu6tc9u9tvfah/nodemoto.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/65433304578.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/vovuzomikig.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f72620da25c---lovodirigepulido.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/sotuvusavox.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/31408129517.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/salezazamotilur.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160867e72d5091---33008026230.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/tetajikin.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/74674486137.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/8281963238.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082c66852ce1---78049007861.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/ketibofufemitozabaz.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdaab210f37---vebuxebapavozemibotu.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e40004b78d---movozagukala.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/6194400875.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/72897770669.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210627_D8B4FCFBF094DF84.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080cdd78c285---86872116544.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/hsti728nfu8cb5jai8g8nribh7/nijajuvigigopetimivozum.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/97ff03bde29ebefc276e378caf56b862/47292767460.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/tebowavubamibisolosuw.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa83a10aa2a---jefesuxukalobi.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/51510836074.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_off0000b5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE04 10668 bytes
SHA-256: 6c4d6f46d93af4e6da6a6a83e1a7443a7ff2a61fbc1b6bd3dc183f84ce868f7c
font_02_sfnt_off0000e670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE670 14904 bytes
SHA-256: 593d47aaf96e31868f522e9eff5d03a920a52948452e4dfa623d7ffb7c57f9ae

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