Malicious PDF — malware analysis report

Static analysis result for SHA-256 e16c6924f131c9e2…

MALICIOUS

PDF

109.7 KB Created: 2021-06-15 12:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d6cd2498542926627d5ca91ed296c1ad SHA-1: 7580d399a81e5180175b58a7ff5115a69414228e SHA-256: e16c6924f131c9e2317e689b8c20d4ea357935eb4e035899c0a9004e8cd2f1d9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated, but the presence of URLs like 'https://krisoc.ru/uplcv?utm_term=lady+popular+fashion+arena+hack' indicates a lure to potentially malicious content.

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://krisoc.ru/uplcv?utm_term=lady+popular+fashion+arena+hack PDF link annotation
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b2452cdb66c---mojibu.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160983ba8ae7f5---30015361923.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b31c22b83a8---lutoz.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c01da3edfc---77736668352.pdfIn PDF document text
    • https://cape-electronics.com/media/file/tinimevevaxozivagomikif.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609194a9ad5aa---sejobo.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16072f9e4679f1---65447793847.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/45193630672.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/odfhj06hovl6chpqdfir0bq4se/babibagunu.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/1qk3aenar6np5c0jp36it5n006/janakujulujodolasoxij.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609efbe268ea1---befizofetenipav.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/zigivevumujogev.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/4ca4e2785c0fff82721579a1431f1766/7751417474.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/65bc29e2340538acef28a29b7fccb142/60440307179.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_off00013605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13605 5348 bytes
SHA-256: 9e5a13d89798cae2ea5eceecc8188906e3597c5a7a4b6d71bc0f70eada143b5b
font_01_sfnt_off00014839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14839 6320 bytes
SHA-256: 69c0b27b5fbf25dd05379a60420beb0d4f02ac8f62ca6bae088f689c644ed301
font_02_sfnt_off00015f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F0E 17548 bytes
SHA-256: 693a0411f5f98a36677fd6bf1cef7e94bdd4f9fae4fa9815cac40a887beefb80
font_03_sfnt_off0001938d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1938D 16212 bytes
SHA-256: ed658a491a0c66dc931007194078d110627770fb88b1c398530762a2a54e794b

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