Malicious PDF — malware analysis report

Static analysis result for SHA-256 15c41f4e59dac4d7…

MALICIOUS

PDF

86.0 KB Created: 2021-09-02 04:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 37a9880ebc4a3dc8525c30b70dc7c3f5 SHA-1: 681a98c6ce2fef2edfb7f955da51a1c6e85119d4 SHA-256: 15c41f4e59dac4d76c52955e176a2abbad2d59e1a5e6d099a8afbc6289ce5cfd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous URLs that point to compromised CMS upload storage and disposable hosting, likely serving as a distribution point for phishing or malware. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://huntic.ru/uplcv?utm_term=uncharted+golden+abyss+manual PDF link annotation
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070ceb777e4c---jomajev.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/fanaginenujo.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/1813c6ee545d5c611794116f7edfb729/47935859575.pdfIn PDF document text
    • http://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/lawunoramomima.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080536296b43---87620429872.pdfIn PDF document text
    • http://synowka.pl/galeria/file/wepidirovutedotanabikogen.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/bb3d384aaa13d7d97929f415f2ca3d58/71907677856.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/vojununajodonozolobox.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/vodomesirojoliw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cc0cb1816---wifugejixipikujuparoj.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/34227608278.pdfIn PDF document text
    • http://pjcwyy.com/upload/file/dumuzike.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/8b16d29c0ec0073c5f5c4574a6773130/72290057702.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/garasupitibavefusejomi.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/18973406722.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa96da126e3---7955460075.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dffabb111aa---52998346161.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/460d2f3e3a624e891ceb88f06f733f3b/xopig.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160877fb7415da---63956745170.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/95706300324.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4bdf2edb---79635359752.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c333ae037df---xibatefoxalajutebuvami.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_off0000e5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FF 19424 bytes
SHA-256: 3adc2c78176ed6c33a8ce72eeda475a85d6ab059da8919be87af6cfd24f89779
font_01_sfnt_off00011883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11883 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001309a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1309A 11084 bytes
SHA-256: e562845711f028f6b4fdc8ed4fe0f26fe6d5a0ac2a461e3f57c7591c30305fa3

Open this report in the interactive analyzer, or submit your own file for analysis.