Malicious PDF — malware analysis report

Static analysis result for SHA-256 c36aeb02295ae708…

MALICIOUS

PDF

100.2 KB Created: 2021-08-13 00:41:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: 74de90851561d628272ed883ef6aa867 SHA-1: ade721e09f6ac39aff78d9df5625e99e65ab20e6 SHA-256: c36aeb02295ae708782f45680beaa605b497143670110e36d204fbce66534cb2
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 0.9986

Heuristics 6

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=wilhelm+wundt+y+sus+aportes+a+la+psicologia PDF link annotation
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/02785febace0aa7fb83894b9f6141585/simorokulusesaw.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/jubutumelubufonojukifaxu.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160995d4d0415d---39546240346.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/67031840956.pdfIn PDF document text
    • http://wohingltd.com/userfiles/lijido.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/purorebazutewiwobusife.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/ecmagtgiol8fn6pku9d4366n87/bowuwenibozezomepere.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/99658353116.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5df67c27f---vojujapusibaxejabe.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/9219804957.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/280690871.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aa8a36d67b2---32575054378.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ac86d33d4a3---vovoxuzawubefodikifa.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f8692fb961d---90547165044.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b55733e89---bivumotojepilog.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160d47db2453ee---keloxopazo.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/lonotirewejofugofode.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/radalokemuxulorodip.pdfIn PDF document text
    • http://kaies.cn/upfiles/210805134529700202n0p2if.pdfIn PDF document text
    • http://18554080.com/userfiles/file/kiroto.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97677690794.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2d7691fc6---vafomexurunu.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/3772258108.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/warekoz.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_off00011b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B58 11252 bytes
SHA-256: 3b4b5eb4ec4b8e40beb038acd9cdca3c2cf9fc98ef883b4aab5088bc944f2d66
font_01_sfnt_off00013561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13561 20868 bytes
SHA-256: 332e6fd7d545aa8b5684925a2ac03017449c39ccee23c1c4313d3a42e5ca60b5
font_02_sfnt_off00016896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16896 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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