Malicious PDF — malware analysis report

Static analysis result for SHA-256 10efbca3166ea8ad…

MALICIOUS

PDF

86.4 KB Created: 2021-08-25 05:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ba20fe973734ba368d3c8b55d776d990 SHA-1: 87daa53cf8575730bc480dce134dd689d11f8094 SHA-256: 10efbca3166ea8adee65592e473c84115cf88e7bebffda6ee36dd49910e0e5f0
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised WordPress sites and other potentially malicious URLs. The presence of raw IP addresses in URIs further suggests malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://szilasfood.hu/pic_upload/files/veguzopusezesodoxi.pdf In PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/qcbj5qgomi0e3mvjen3pq260kg/juvugokikasub.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/7r0pgjnp0tum39hb5dioor73cp/88839497935.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/6be44fcb768139f8443ad43b4e8ff60c/44387684193.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160a8efa9ddcf8---17399473496.pdfPDF link annotation
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b68a35df746---84381512679.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/95439718421.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084d3db8b665---xudoponolegerekopifazelel.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/99682345083.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f84bacbe21---88696342161.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5eb953fff---migosap.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/35384082630.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/d8cd1fe747096fdc4740a933b6e34a48/nilebelodenov.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/sogulozebanaxivijulatuxa.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lidupeviwakodefew.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c36c3942af---71205854420.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/b91dckjo5fv9q3rgia22ecu3dl/32655657790.pdfIn PDF document text
    • https://majubesar.net/contents//files/wisot.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/dojenomurewabeku.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/1b6ne5onkj7gnud7jbhob2n0ni/wamirilemit.pdfIn PDF document text
    • https://kimansion.com/uploads/file/foxosufemijol.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/tiwogegovujanegilopepuj.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/19165939998.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/kovavonevu.pdfIn PDF document text
    • http://zjgjqmr.com/v15/Upload/file/20218111925599828.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=madison+early+learning+centerPDF 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_off0000ec1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001042c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042C 17988 bytes
SHA-256: 9bc2b0ab4befe252e9ed3cccdc64c9d490331131b4b7a627cede5fad5f8d220b
font_02_sfnt_off00013333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13333 10652 bytes
SHA-256: ec8b1a4e10674ad991d4efa0b02df08c7848e777e2aeea5dca3bc17025984ba8