Malicious PDF — malware analysis report

Static analysis result for SHA-256 d24c86b44fb11c81…

MALICIOUS

PDF

81.9 KB Created: 2021-06-13 07:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cabf5f1deb7b5d5f4456e1297622445a SHA-1: c6d9b850ee8ae0de3268dbf39a42714822d5802a SHA-256: d24c86b44fb11c81c6ac2f6cf9a46fd3e4cfccb8b2580e112386bad1d1ee0fe3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of external URIs and the overall structure point towards a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://wastran.ru/uplcv?utm_term=math+vocabulary+crossword
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9d6fed7a4---25053556565.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/l9a15mdg12uu1vpanniv53lhn4/torivotiku.pdf
    • http://mateuszkucharski.pl/admin/file/xumixoviloxopizafagax.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/328a5fa2c694de2ec83dc7371a391a40/99769198014.pdf
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/wasegolatajegedufumite.pdf
    • http://adance0112.com/upfile/editor/file/36947503596.pdf
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6bb8b3494---gibaraxemaxelim.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160990f920c070---59739282788.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607750d7d2f7e---28588608645.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/3fjits9mtndahdv720m3lgunss/kusatafewanowovixalenirip.pdf
    • http://reicar.dk/userfiles/file/gutewesosaki.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/aaa82f3701246f65f1a954f96f508e52/54439634484.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/1a4f73d9f73ca95cd0bece859e211794/41471847332.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/63e472bdb88a73e861f2923464e6eb02/putezevazibemirewexu.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b8264148a---52482287014.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/065c93843c736470a1b83a566499ec85/busunevowaxuwu.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/rgro3dg17gea20n8lseeft3mos/divusosirerumulot.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/9f760b0944802e1213476d3617004469/sibobuvog.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16070a37cf22e9---movisivi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6cc.bin
181de7b6aaa24754523faa9ba651243f2c109b4693d9b50e3c96b218b60bc36f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CC 5036 bytes
font_01_sfnt_off00010817.bin
40029cedc264eebf02d07f06d63895d12486c305e001aefaca2f24753151d83f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10817 10672 bytes
font_02_sfnt_off00012c52.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C52 4324 bytes