Malicious PDF — malware analysis report

Static analysis result for SHA-256 129c97f3d909349e…

MALICIOUS

PDF

87.5 KB Created: 2021-07-19 09:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 94a18d9c53e444bb0c604286c8d08f0a SHA-1: c7151c7ad7b3ac68a0c6e8876ec80c1358d8e0e0 SHA-256: 129c97f3d909349eec68020543b1ebd5abc450fc7c01bfa616d8cb8ae58001b7
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains a link farm pointing to numerous URLs, many hosted on compromised CMS uploads, suggesting an attempt to distribute malicious content or phish users. The presence of invoice-related language further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://nipissing-lodge.com/clients/b/be/be32fa5c9d1e5a871f1efa0d35b29fe7/File/80281855977.pdf In PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/36417181467.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/gioc28uui478t8gu8h7c8vqqg7/14531434686.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16091e3d5e51ad---rulamidovadi.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf1921a674---wopumebemavi.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9810c8bce---pojusuvodifikogikeb.pdfIn PDF document text
    • http://51www.org/uploadfile/file/de1c3c6efda8ac90cfb28ecae74a2cae.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/giturowejovejiwifevixefum.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/151aa0db8a7422badb104de8e2c33d50/vebawedoba.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a80dbd70478---dabanizugodazuwunivu.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/pevupurage.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/c9bdb7d58f1b2b75852b8e57fc31675f/42709071302.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/00396f00c77f88a8e224e4990e5578ec/zovelomanawiniji.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/72371151208.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094936337585---bedibodarepa.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/tolunofatakodorolevewexif.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a236d1d6935---22233813634.pdfIn PDF document text
    • http://moristas.com/userfiles/files/damagafigaludarawo.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160879419438aa---xakajos.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/35055598904.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/67591046829.pdfIn PDF document text
    • http://dnepropress.net/files/file/46204670100.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/57787573991.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=life+science+grade+10+term+2+control+testPDF 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_off0000eeb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB7 17668 bytes
SHA-256: 13f96a458424cfc69a94fb6ad5bad7f38ef4dc8b1392cc364b71af358a35741d
font_01_sfnt_off00011d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3D 11072 bytes
SHA-256: b8683d89e3985b7529da60f22a11ee0386a0ec3274ec1af8515edff1f6907660
font_02_sfnt_off000136f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1