Malicious PDF — malware analysis report

Static analysis result for SHA-256 9733c9b0e6700e75…

MALICIOUS

PDF

87.6 KB Created: 2021-07-04 17:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 504170ea8bf67ab823a1763c9e1b7b68 SHA-1: fcd152f9872eedb647060586f515f31b3fed8443 SHA-256: 9733c9b0e6700e751c8860b51c02a6ab89c549967ef17fda40fa885aa33c8d46
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content. The presence of external URIs and a link farm on disposable hosting further supports this phishing and redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/fc10cd3c6a82eaa14e8b2c39f56432c6/dedatufoxijagisux.pdf In PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72b33ae712---49185846914.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/wurusosuladotalenujol.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/729ea81b443b2abeda0ec4a4985c1253/wazev.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/soxejijofug.pdfIn PDF document text
    • http://sun-eko.eu/files/file/dusefoguripozetokuke.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/ladofut.pdfIn PDF document text
    • https://ckmusicdesign.nluserfiles/file/27632125528.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/61700657284.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/dd1c1a73f5a1bddc4ceb4cf6d6369a1b/saxuxon.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210629_153436.pdfIn PDF document text
    • https://ddms.tw/upload/ckfinder_temp/files/20210703042435.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/wupositoxef.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/22311208320.pdfIn PDF document text
    • http://puppiesulove.com/clients/7/7f/7fa6d7836ea929643a3c23f4562b158d/File/59488272654.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/5b7febbd0a398c58aadd3eddf71ec091/8505593979.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/kosonekurowak.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/siwil.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/56b52ba1dc4abc809816b77868c558ae/davakura.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/e3bced8caa8fb6d564d23bce6e260f2b/zosuxorovazadulitivejena.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/finufoloxalub.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/1e660b96dd19961d311ee5c2e1921c66/39965238675.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=simple+adjectives+worksheetPDF link annotation
    • 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_off0000f1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AB 11124 bytes
SHA-256: 4eb3ae312af59f3c94390dec5e9f02850222b961fac1d55a6a588f7c1c76c546
font_01_sfnt_off00010b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9F 17408 bytes
SHA-256: 849cf08a01d44156dbb9d9575e8f16c9f1a71265eb6c8c7f6307e0515358033d
font_02_sfnt_off0001393c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1393C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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