Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3db15a1eab53f42…

MALICIOUS

PDF

105.3 KB Created: 2021-06-30 20:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: eafdacb75652887a515108c9b5ffcbc5 SHA-1: fce461e203697033d4826027e7324fa05272dc6f SHA-256: b3db15a1eab53f42a97faa0b5ee8bb0ffd5e8b8d575b1240eff4e7f9741e48ef
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 0.9930

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=best+white+to+go+with+agreeable+gray PDF link annotation
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/d6dd5696eedcaab795392c80a412f670/51647073946.pdfIn PDF document text
    • https://kopari.hu/files/file/18938314911.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/dagawubizufekijedeni.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7873517c91---jevuxirozikoxi.pdfIn PDF document text
    • https://langumeistras.lt/i/File/72696269043.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/314f4512dbc6043ca98b7bd123f11813/pofovunawegu.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928b5fc3e0a---7810036953.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733f4a1fe87---18526092737.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4db674613---73458810776.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/petuzezawafadodo.pdfIn PDF document text
    • http://armanetti.com/images/15721999118.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/tofupoboriles.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/37649195875.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6c95b06b5---51428808730.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/dikukosozudoxevapeno.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16087eb87d958b---52375381875.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b08aef194---sikelilozuremokagalu.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/6mathoc1fd2inf1lu418140b6d/mewutig.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/92128954760.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/64624954411.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/xuvufalokixewogebe.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001226d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226D 17964 bytes
SHA-256: 499c395a315ecbd5507a70ac1be1815ef3f4a44a3690da95f582d6700251e475
font_01_sfnt_off00015139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15139 10676 bytes
SHA-256: e27be42b3298b1f2f8e77eb665ddeb5027e366f3142ad6fba73e5b4c068854a1
font_02_sfnt_off000169fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169FB 16160 bytes
SHA-256: 5c13cceb9d36bbc2bc20aea0fe1d16ac5c722eae827defaa6d249ccd2c25c082
font_03_sfnt_off00017f83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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