Malicious PDF — malware analysis report

Static analysis result for SHA-256 095844a99bfea16d…

MALICIOUS

PDF

81.8 KB Created: 2021-09-03 21:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 8dc8a9b88d94e3a7b052004198dc1ac7 SHA-1: 435d91609c1298908ee8f1201370ec74d2b43897 SHA-256: 095844a99bfea16d74ce638de4f1e1f23d655d6fe4fc3bb2e33c8c6d8ff0789a
164 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 and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://villa-carlshorst.de/sites/default/files/file/jadodewikeziso.pdf In PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/vigedovodupipituradi.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zaruravikilufe.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/foxevisusitemepevujijib.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/dugidurototetadaj.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/7f66c696e6a541a057f6384447fab7a0/jumozepusixuf.pdfIn PDF document text
    • http://kgmda.com/upload/files/38291476233.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609865c1a7e89---21305662702.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/53001596911.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/sejuxapulojemas.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/b979e13ca3600dc6b074dfb066f8e84d/56036802248.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/29229491265.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/sugakiropajozixaramipe.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/lizedopuwo.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/96307530241.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/2845bd2cf2be477589599211ed5ce94a/87309258178.pdfIn PDF document text
    • http://samtekelektrik.com/files/18699465014.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/82cec455738824fb6e812320aed01ad0/degijolapez.pdfIn PDF document text
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/77313087161.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/63778910770.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/21acf1627164ea7c8c0bbeacda971a39/11191851487.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=types+of+art+styles+pdfPDF 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_off0000dc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3E 10372 bytes
SHA-256: aaadec936aca03374d38f4b443683c161685edb639b3598678e46122cf3cd8a5
font_01_sfnt_off0000f3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E3 17788 bytes
SHA-256: 33c74ee14747a268a87b4ff909278081642bc8c4f448cb2f4a2fb55505575e3f
font_02_sfnt_off000121eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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