Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e033522bb516265…

MALICIOUS

PDF

86.9 KB Created: 2021-06-16 15:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39c7531c2d380af0ac2ff92cc61cd0ff SHA-1: 79cdfba59e13886330b1b3c6ff153af1925e54d7 SHA-256: 8e033522bb516265270185e0f60e07ce804280d9caa26546e28bd73a4c7ea0f0
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a link farm with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to distribute malicious content or phish users. The presence of 'utm_term' parameters in some URLs indicates a potential SEO manipulation or tracking effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://huntic.ru/uplcv?utm_term=command+aimbot+cs+go
    • http://karpatskiles.ru/store/files/57268403132.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/d2h9bi94mrdmasb86q9mqudcp4/zadabebowik.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091801d41572---jurawosexeloromofinesi.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/ef7175a1113f2908ba5ff0f19271ddcd/68470724446.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/5d2ff4c7384f44446a91f1a57ae61146/rebeji.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/08bdb62a8fcc816c3739fe8b7c48943c/worewimomofalewozuxad.pdf
    • http://airelimpio.mx/img/editor/file/timekotakabunuzorofugijom.pdf
    • http://affordableadobe.com/ckfinder/userfiles/files/41486371571.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/4fc0c2c265aa7a05a6b0f93c2acfcca2/81097652892.pdf
    • http://www.cddfct.com/up_files/file/roditukidime.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a805f34912---rusazaxife.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7fce31978---97910749673.pdf
    • http://cdmvt.cz/sites/default/files/purisaj.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/9f72b6040906be32aed0709c064c39a7/xisanozogosaxodaj.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7699507760---timan.pdf
    • http://emmanuelmissionarybaptist.com/clients/74938/File/nasireraxajemup.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/8b4b0658aeab3083c86ffd3db4f4d917/700344459.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bee9c69aba---46328845218.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fffb.bin
0096984f034c8208fcc09a593e37b64bad7b8795e3b26def17060ed6df2afab5
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFB 5176 bytes
font_01_sfnt_off00011180.bin
289e130ae7ab0cd4a9a5c8afb4ff2c73f070f920569e07f6ad52ba83fd581538
pdf-font-stream PDF embedded font (sfnt) at offset 0x11180 11740 bytes
font_02_sfnt_off000139c4.bin
5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330
pdf-font-stream PDF embedded font (sfnt) at offset 0x139C4 16060 bytes