Malicious PDF — malware analysis report

Static analysis result for SHA-256 4505f0285d8436ed…

MALICIOUS

PDF

75.2 KB Created: 2021-08-21 08:41:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 2582f40b45aeb8fa89de877c7bbdf441 SHA-1: 4cd8ca1c5114222c5a93a190cb825d81019893f8 SHA-256: 4505f0285d8436edbb663fa115dea908b4b56b9ff4178867e9f4c2ed4c6a7980
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://coretry.ru/uplcv?utm_term=interpreta%C3%A7%C3%A3o+de+texto+9+ano+em+ingles PDF link annotation
    • https://alshamiltrading.com/alshamilfiles/file/sivomuwote.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/87949685730.pdfIn PDF document text
    • http://tianfonmm.com/d/files/56094467315.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/zonagumas.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/tuwawage.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/vh31l9r42fvhc2hf76kiladtb0/47305089512.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/84007547005.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/36686805659.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/76381732585.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/39118868026.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ff160ddc0---zarewumitudibajidakafi.pdfIn PDF document text
    • http://accessoriesunlimitedinc.net/catalog/file/4054558363.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/woluseper.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/ma34offp4e0vihreoh4ds3acad/15320821101.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/jenor.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/11sope9fge5kl77sgngotjudk2/68275764823.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094ffb99ebf8---70663298102.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/8347051250.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a17a15c8d64---30929504811.pdfIn PDF document text
    • http://wahibluedevils76.com/clients/5/55/55d7338a7abcce318bc847d7f34994f5/File/55295622146.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cce6d9e36---31180020113.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c54ce0e084e---peregemakunogatu.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ll7g0ug1g07b40soist68vgqe1/33766611949.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_off0000bf27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF27 11420 bytes
SHA-256: 71f8d476b5e2c87e001545e3cc5359215afd9f235782cc299fa4659bae305a07
font_01_sfnt_off0000d970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD970 17744 bytes
SHA-256: 657a837e5c0c0b071ae0df770b6ba293ab2e3df17ba1a952c5c62d183d381d72
font_02_sfnt_off000104b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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