Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d5a9cbb3137318…

MALICIOUS

PDF

82.5 KB Created: 2021-06-15 21:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d17571386784c7340cfddb70393be862 SHA-1: dad6a04142dce54644a11d8f1faf48705976c057 SHA-256: 85d5a9cbb3137318bd58aa0dbcd4e991cc61f7e0203ba8f46a1df4e9b5575ce4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed for phishing or malware distribution. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classifier flagging further supports malicious intent. The document body, though heavily obfuscated, contains text related to a game ('Rom zelda ocarina of time n64') which is likely a lure to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://coretry.ru/uplcv?utm_term=rom+zelda+ocarina+of+time+n64 PDF link annotation
    • http://marinapogon.pl/upload/file/wurokebomurajamufujutu.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2faf86326---javubokuvito.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1622745510.pdfIn PDF document text
    • https://medtek.vn/storage/file/karobi.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16076bc12239c0---jobukunofebo.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098558b90dd6---gaxalalife.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/470aaf2efa1ccc62ea8ba1325a0477a3/99657436584.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804dbf5926b---70330839094.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e90e39a533---tiworikibubufavikafemejuz.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/etimlkb3r2jovgnprsqlls8kj3/diwaveronef.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072629c994fe---zevefeleputaweto.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/wewotigufojepux.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/zuliziri.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f21f194ad8f76a7899e4f8e1c7bba1d7/72369267754.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/budikatemudejoguz.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/tanazugaxogesidafexufom.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a740b89d846---luxokixe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D0 3056 bytes
SHA-256: c7d97b0647736e55493ea07790441d2c1b1785c5583c210b85690781b2a304d8
font_01_sfnt_off0000efa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA6 5288 bytes
SHA-256: f0641e861a57d3745cf13008a0905cd2fac00b59277adcb210eb57dba1c78150
font_02_sfnt_off0001019c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019C 10916 bytes
SHA-256: 1798ce2075617efc2397f0e0c21688a274b5f4ee87f8637dc3ee3946aef498ec
font_03_sfnt_off00012683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12683 16312 bytes
SHA-256: 975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15

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