Malicious PDF — malware analysis report

Static analysis result for SHA-256 38b517c8b62e47ed…

MALICIOUS

PDF

98.2 KB Created: 2021-07-13 21:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 271bf51a93f693ba0b7acc066539d6c2 SHA-1: 3e5c1bdf576ba8497e9b46c78797dbe84f9fc1bb SHA-256: 38b517c8b62e47ed2546c2e5c924c5ef82e0a8103ddf07c2e3bf5f115658cd58
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 0.9800

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://krisoc.ru/uplcv?utm_term=parched+peter+crouch PDF link annotation
    • http://iaestedresden.de/userfiles/file/3024566815.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081dc1f68f6d---pufol.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/7374add8ea0345bd02ef2e16f98f2fdd/36326171816.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/7btb41oveda5nredv9k05790nr/55150624839.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/67878919423.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/thcgs8e2orqbl7c4jtf98qlrgi/65055721118.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/nekce4vju8t40ms7p33isebrf6/36279311235.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/37392974233.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/46493041030.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/58140451965.pdfIn PDF document text
    • http://web300k.com/upload/ck/files/59030302395.pdfIn PDF document text
    • http://slphs66.com/clients/e/e6/e62fa13cff665df70d7481f632b33819/File/50176340722.pdfIn PDF document text
    • http://simonide.org/userfiles/file/31088557329.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081b7d58a11a---78834258940.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/05b98fffdecb581589a0dcdbcf0507cc/dadegedozupuxu.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607754ef69435---21912031968.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160984b88bc295---duripigoteka.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/sozupib.pdfIn PDF document text
    • https://artbynela.com/uploads/file/87529867095.pdfIn PDF document text
    • http://findplusltd.com/file/25131008508.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d66def74314---19556238876.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/gusokemekar.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160833878dfbab---lodewivemedolaxakikuw.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/be210082cf14facb7653977cfb171762/pewusefoxufokoxituku.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5126740161---laraxozizode.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac685981634---95944095144.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_off00011c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C84 17492 bytes
SHA-256: a2d44a3d8a1fb59a297c2a39c5ea66b11fc0141d28b57714435883a0d4540209
font_01_sfnt_off00014a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A59 10300 bytes
SHA-256: 6f49888587a78473d7b98f189f2565176f8afbe926482d4c5f7cb41217eae94f
font_02_sfnt_off000161b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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