Malicious PDF — malware analysis report

Static analysis result for SHA-256 b44e412ce1fc88b5…

MALICIOUS

PDF

88.1 KB Created: 2021-06-29 18:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 664f324ff4e087ca80a5e618894b5117 SHA-1: 84d83ffc0b757a51b1f100236cf21ab79b281c94 SHA-256: b44e412ce1fc88b5d4d916f1127e84c836695a45a48be3b57e4d43a527545967
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and is identified as a link farm hosted on compromised or disposable domains. The heuristics indicate it's designed to redirect users to external malicious sites, likely for phishing or malware delivery. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://xn--dlek-5qa.com/admin/UserFiles/file/lifinujavawovabal.pdf In PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c2945b472---57142619363.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d730180d7e---10522405366.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/95bfbd774d1a40a13a66ab5ef8c460cc/72875755057.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b85537b58---12215039554.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/d15c8805c7f2752596298669ca44f831/pawopetekunelalosawukewu.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/628vbs8vcg5c220chfeso8q1t1/24279228202.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/9amiq1euv65o5i4lr4hl28fl3u/zafefolizibi.pdfIn PDF document text
    • http://kurpinar.com/img/userfiles/files/xezajimuragefepike.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2884986ce9---tazoxabopemi.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/99996606665.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf24e7c2a7---11304451058.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160793797b8ff1---56658769955.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d5e3860ba---zodinoga.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c12bd999c70---nogepeg.pdfIn PDF document text
    • http://abc-tel.ru/data/File/mekijexexomepisi.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/a388ure16q6r9jjqjuplcrlai0/23540537444.pdfIn PDF document text
    • http://skikk.nl/app/webroot/files/userfiles/files/witibopagegizifewokovetu.pdfIn PDF document text
    • http://funperm.ru/content/file/90571346735.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/1dde2d88db6095279e84f921bac35d2b/65363967039.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074f8a01278d---jorivagesemupefuledolefoz.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/ab3c50fdc5475c879e3f50af21741fe0/nadaker.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/52416148138.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/72937f564d58f0b9373bb1120225990d/ziweloxo.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070425f32cdc---lebizitas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=plural+with+s+at+end+of+namePDF 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_off0000f516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF516 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D28 17320 bytes
SHA-256: 55190e51d052baa736d63640023efdfd4bf571cd8db8170ac41c258190e489b8
font_02_sfnt_off00013a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A60 10808 bytes
SHA-256: 9cc876f4e113ef72c526158d9a9c2b8617a41b7d4746882ff74efce21375d036