Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa67c65c68c16043…

MALICIOUS

PDF

71.0 KB Created: 2021-09-05 00:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bef38239fb6eb8f9150d438b3adc43f3 SHA-1: 2ea36def0c1be6b48ce003e5b02fcd74100589f5 SHA-256: fa67c65c68c160431959309dcd5104c1126e576270ec281bf2e65c01d8eb4669
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the nature of the heuristics indicate an attempt to direct users to malicious sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://smidgel.ru/uplcv?utm_term=free+worksheets+ordinal+numbers+kindergarten PDF link annotation
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/cd011be11f6220579f11cd12e1115df0/90888044874.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/94215116971.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/sagesurojidimusew.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/09ce1d61924c4b53d9cb517b50f01bb7/39319358369.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775a281f891---rexezeruru.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/zonobafafidudodusisa.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/jiravefasokusesepe.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/vagujo.pdfIn PDF document text
    • https://masihpt2.com/contents//files/32667545285.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/jaxuwarunatok.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/3b6ddeaee5564c6c0c95956b528b1285/74120668361.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/pisovizitupiwenufi.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/aa74411e7056b7382d278f0c5c5ca642/91561436139.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f66458be76---buxonaxisugobaj.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/punik.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/80853861740.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ol3dq9p9af7ckj8h2e82t5rkb4/41995286581.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1611aeb8b02dc9---ritozozeroj.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/mewunonem.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/pemoxogatamoxakonaf.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b9960fae3---judonufubafubovasaguneni.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8dc24eb70---fubaguzu.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/rukaborevejapolomesuxufox.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_off0000b5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F8 11092 bytes
SHA-256: 4c164c5de96502755b4ab5d08bdacc324b095c761562cb69c993ece07aab6f85
font_01_sfnt_off0000cf71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF71 15260 bytes
SHA-256: 6fe48b358c9e30e961186d47551e00ee123aff9dc8f596631275cd9ed9fe7401
font_02_sfnt_off0000f647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF647 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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