Malicious PDF — malware analysis report

Static analysis result for SHA-256 3043007e9d043748…

MALICIOUS

PDF

77.8 KB Created: 2021-08-05 23:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: ab3e28bbab7b156de8a7ad6e303a80f6 SHA-1: c7315c4ebbe86309254da55c8fab530ca5cc06fd SHA-256: 3043007e9d04374879ff4e2c0954bd3bd10f0c348e2dc37566081f4ccd5c0a76
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-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://coretry.ru/uplcv?utm_term=comparative+and+superlative+adverbs+worksheet+3rd+grade PDF link annotation
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1be2af3ee2---99894216247.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080284a80693---xatajufumezimubemorenuw.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/3a126d97051d914c5f8f530c950f7edc/68013277074.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b94781e62ad---bovetumowadaju.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/98663778299.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/s2du0dbu00q808v5a4sdl0hi24/kiforeronoweda.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/boxuwaso.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/66513128133.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/salasixomurowunidafube.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/9677229896f5a0e2b5d8da04aa5e474e/jodekafanilubedonepezu.pdfIn PDF document text
    • https://zd-zeta.com/uploads//files/202108030345165103.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/zazurebukin.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f5e0ee626---587678767.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/tukis.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/4312500039.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/35402037139.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/48677949777.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/pqp67b9oet1m97q6rlmh25bms2/murupi.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105aacb6f38e---sikazofakopamuxazaxugere.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/wawibexun.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d567f122ef---24881098962.pdfIn PDF document text
    • http://corestandards.org/EIn 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_off0000cc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0F 16452 bytes
SHA-256: e4677a881afa5042a0ea4d4b3cbd701065a3dd80cf7d19cd330e6400a72fa018
font_01_sfnt_off0000f6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B2 11524 bytes
SHA-256: cfb8382f30ac95843d51c308e1c1e2518ed7964ea8a7a18979e06a6df18b1e6e
font_02_sfnt_off0001117a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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