Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0284f2600788aa6…

MALICIOUS

PDF

83.5 KB Created: 2021-07-09 11:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 07b20c6f0072797dd6dd7612ac2b1972 SHA-1: 738bec90f389946d612a25df28f6e0e5063c7139 SHA-256: c0284f2600788aa6b38d2f77941f7a7bea701938e4ea8bf48b654149a6d932db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The primary purpose appears to be redirecting users to potentially malicious sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://lhsclassof77.com/clients/34792/File/27040979295.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/u9cl7de3nrehtttf9ogf2ut4e5/47442692274.pdf
    • http://metabolit-plus.ru/files/file/jameduvire.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160832d358bd42---fagemaxatepipeguf.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/6am2466916sfgts6leq6cu4n04/navunufolimejifisexoxuki.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/6igctkf0519usg2mppa6e1vv9f/nosilipenizorigatetasikit.pdf
    • https://artbynela.com/uploads/file/6361208987.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/218c8f31640ab62b1eee0a01d09239e3/fojikudimamaw.pdf
    • http://dailymaytrogiang.com/userfiles/files/30907352904.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/e94a00e80cd824a0700b42d026cf2845/konakar.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b18e4ac99b8---posifurofi.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/5ep57nci2d1o0k5oi0pnpsb4kd/15657817802.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6606cde047---nulaxexadebiba.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/lvneat4adu8jabmrm0n94pjdao/xuvesanusas.pdf
    • http://andlupa.com/userfiles/file/vipedod.pdf
    • http://euro-ex.com/images/blog//file/butusezuwoj.pdf
    • http://files.ibiza-ferien.de/file/bukopukalijikeboxuzir.pdf
    • http://littlepearlspublishing.in/data/eimages/file/47923934587.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086f41f7cc6f---lovavorikoretemewuforawus.pdf
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a16b27155d---seridilirasutomux.pdf
    • http://ugrctrani.it/userfiles/files/36864896101.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c090b6920---tizafozag.pdf
    • http://affordableadobe.com/ckfinder/userfiles/files/doradelivawivilemuza.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/1ba2c674735ad609c9f2119f0bab5b56/wokolamovepoxe.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4afec84c17---wepepikop.pdf
    • http://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/46488388658.pdf
    • https://accuratesearch.com/userfiles/file/samupewabazodi.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9566240fc---kafanuxu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=th+6+layout+defense
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e661.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE661 16792 bytes
font_01_sfnt_off0000fe78.bin
3399dc8a5890ed472dc7f177df26a5e08fef9827ca6725e630ea9d413512a376		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE78 10604 bytes
font_02_sfnt_off000116c6.bin
7bd99737f77662baad3d1621a7d0fa23a3a4172bf6a67c2afbee25b5e2673d65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116C6 16192 bytes

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