Malicious PDF — malware analysis report

Static analysis result for SHA-256 585589d823a2e728…

MALICIOUS

PDF

79.8 KB Created: 2021-07-15 21:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 20e85b1f56f353f584b1a83a1e37bd46 SHA-1: 7ecc193d50441bb6c2f0c6b7c0d3f6d71e8e4395 SHA-256: 585589d823a2e728dbaa6ed7bd88faacf6617c3dc545354777ec9486838ce24c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to obscure malicious destinations. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/82f9776ff40b7c735cf3a08ea7cb8edc/wuzukejopotasejenoxenoxi.pdf In PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e9ac340fc---62524069379.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/79020944438.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/ef02e109aeb9ab773fff0662cd7732c1/jedizag.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/lugotili.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dfe62c627---zobaz.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/89338536726.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1609de46da9e41---56286955456.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/gopimuwelolab.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/tgfqn88kpsqksbpp56qkq5p1c5/27038134160.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/12646910845.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/zatomafozasafidogu.pdfIn PDF document text
    • http://poorclarescork.ie/images/78602684871.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/8ff4187a57910abf4c0314a25435ccad/miberobitosadovem.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/74vpd7hrgthk56hbbp4gjk2eut/94185577309.pdfIn PDF document text
    • http://geobrofab.com/clients/d/da/da7cd3953015cd63472398095fc1fcdd/File/posefunabo.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/44948995554.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/94750911439.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c669153550a---28914801417.pdfIn PDF document text
    • http://didula.com/img/file/xukuxevujasurisesumagofa.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/c052474ba529e8c398123cde15698a8c/47662997379.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/fugiverepojimaj.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/23003646962.pdfIn PDF document text
    • https://mnlex.it/file/96878079874.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aea49f3e7c1---ginigokip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=top+discharge+centrifugePDF link annotation
    • 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_off0000d641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD641 10916 bytes
SHA-256: 4a07e9b16acb2bb5bb6292c76ac93606c10d588960941acbe3c4eb5a19ac4b49
font_01_sfnt_off0000ef50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF50 16472 bytes
SHA-256: c5261a4048126a54a029c09ca771055fd46a8a5a4789558a00919f9c8b67ab6f
font_02_sfnt_off00011a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1