Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cff23a0a2a93a5a…

MALICIOUS

PDF

83.9 KB Created: 2021-08-18 21:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: ba509d40a0dd8873555eddef4a955ea4 SHA-1: 4c42c7b2f89385f6e164ef174ca97a38a0eacd75 SHA-256: 8cff23a0a2a93a5a0e5efac8bae4c994a3b8d5fdb6ec96ad3db0f3754eac3710
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 0.9973

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=assistir+tiras+s%C3%B3+que+n%C3%A3o+dublado PDF link annotation
    • https://ietc-oman.com/userfiles/files/55461402985.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/febuzupiwixopuxoluk.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/75771129133.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/neluwunube.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b10a2efbe---pagajagubufeguwoluvod.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/17363606216.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/sotapulobabokiwifejopiw.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/simuvanunaxetuzukoborore.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/xijetesowexajijowuro.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/62588442981.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/e9ecd005fc202a9ffdb48c84a83f32ec/bagelunobawib.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/70158135720.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0266a34ee3---57694834455.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/f0aeb7b038a23bb72685927c8b2812cd/milowajifamuruwibozufula.pdfIn PDF document text
    • http://hongdacable.com/d/files/sinubesowopufamumorimozeg.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/dapemavibonezovijen.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/9c4d4j1as9betllirqudei0jg3/ronufa.pdfIn PDF document text
    • https://shiphangnhanh.net/uploads/image/files/63029468958.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/286157774.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d034ecba8d4---53198421797.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873bf6983b9---27681078983.pdfIn PDF document text
    • https://webmenuplus.com/images/file/44991074530.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_off0000df50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF767 11012 bytes
SHA-256: 3475e5afcc85821a9a30fa0c709908cf7aed6ef75f0954f5651aea89dd752a78
font_02_sfnt_off00011037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11037 18684 bytes
SHA-256: 5222c7291f0d3ded0b0a638355030e2787346859053dfbbeab369e3e18cf9aab

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