Malicious PDF — malware analysis report

Static analysis result for SHA-256 917f22ba8dc3ef1e…

MALICIOUS

PDF

99.9 KB Created: 2021-09-03 20:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 46f151cc7bd98eb372751aad74d15ca9 SHA-1: e46baddaffdce94d79993a28710f39566a717941 SHA-256: 917f22ba8dc3ef1e4366eb2a01a0884538b5a5c454d1cc2a9cade0010cb9118f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm structure, and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings strongly suggest malicious intent. The document body is heavily obfuscated and appears to be metadata rather than user-readable content, reinforcing the interpretation that the primary function is to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://philabc.ru/uplcv?utm_term=principle+of+phase+contrast+microscopy+pdf PDF link annotation
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cad755e36d---59196298375.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/9fdc01005096d6b8b9b130bd0d3c3905/49441829540.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b13d620cf---nigebusezuvugodut.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/bekaduriwe.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///29962090201.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/58153821313.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/diwajuzuzejesom.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/zonuxepulovibe.pdfIn PDF document text
    • http://salespate.com/userfiles/file/zuxumomapodagupujidodu.pdfIn PDF document text
    • http://rahwayhigh.com/clients/42761/File/zadiso.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/5f9518f577e3672e1621225705a0ce97/nowuxemutibanese.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/bufukudoxix.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/4dddf75e8536d16b8356309332c131d2/22769071943.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/951d187ddab937459207e756f46c4f1f/68589492583.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/lirevepokuderazinofovusa.pdfIn PDF document text
    • http://amandamaitland.com/images/file/14189263848.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/5de6f5c9b7db88e0d017bee91e110283/bafimamivunem.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210604_044250.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/7d54fa5aim9hpsa81mjctmj5r3/jobusiguralorotatoxifimo.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2e343ac62---jenamalamebovapez.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/9ba9b70c91127236ae27aee6e9c03a02/pifimikazodomixij.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b463c546145---40893209849.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/3081210897.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/887bd59483eb62c7988f7d13eabc03a9/mizevonowatekifumot.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/db9206af355bd64e1030d5ca777f90eb/fapagozusu.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c97746e978d---kiloliximabad.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_off000124a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB5 16812 bytes
SHA-256: 21a8f89facb923d9f1d15cf9614af53feedef338dd22f3c982e45ca91e7930c3
font_02_sfnt_off000167f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167F1 11000 bytes
SHA-256: 7922f27bd7fcee4da65950ebf6de0ac7a6fc9677a91941d8e3cd8a804c43e148

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