Malicious PDF — malware analysis report

Static analysis result for SHA-256 86656f4ff305c079…

MALICIOUS

PDF

102.7 KB Created: 2021-10-08 00:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d3b396692b7e20ac15d51b362847964c SHA-1: dcc00f18b59ae48a081434f462c137fc1157bece SHA-256: 86656f4ff305c079065142b5d13cb7c9d7b90adfe12c25c6ea947828db56b48e
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating it's likely a phishing or trojan delivery mechanism. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the ultimate destination and evade detection. The presence of these links and the PDF structure strongly suggest an intent to lure users to external sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://zopos.zohukum.com/ckfinder/userfiles/files/vetasobopiti.pdf In PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pegilelodasidizut.pdfIn PDF document text
    • http://epplast.com/files/file/82880729134.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/20196862501.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/rjkatsasmtom89eu9tnt78navt/49500209514.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/49500738389.pdfIn PDF document text
    • http://vecsecity.info/editor_up/mirazisafegugasekelil.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/nidopakirixanizoj.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/89457585457.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/92863475109.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/gilivosotutidavapoxoz.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/43827815660.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/62620261623.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/rakepazokafajanituf.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16147f848d5b17---fumalofuwep.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/a5705e08c42500e028e1048e28667635/rofawolosukebemoxofig.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/cb83b77037c0ba36377d2e832766a741/36051623797.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/87524401761.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/37659193372.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16135ba1975fe8---25037395959.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/161346b8dd9b38---90260442025.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/8847789038.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/52380985181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=square+root+of+1.2PDF 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_off0001285f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285F 20968 bytes
SHA-256: 03a57560dbc76e1b7e456076fca9585edebd74ac0f7962f02c4dc21aead19c9d
font_01_sfnt_off00015d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D87 10356 bytes
SHA-256: b0c0c36d15da29a74ab12ffd760cebbb0d64b971e9753da9d62c6d56b14d115c
font_02_sfnt_off00017539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17539 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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