Malicious PDF — malware analysis report

Static analysis result for SHA-256 76588305c59cd5ee…

MALICIOUS

PDF

92.6 KB Created: 2021-07-05 06:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: c092a4e83a133e17bcfc1fbde9461f9e SHA-1: 06bcc1e7a9d1fce50e7a0bd7a9dfe06335f17188 SHA-256: 76588305c59cd5ee1d3cbef74b356086a6d061834e045737cd9421edc7177a28
156 Risk Score

Malware Insights

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

The PDF contains numerous URLs pointing to compromised WordPress sites, identified as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple links to compromised CMS upload directories suggests an attempt to host or distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160977ef78c66e---78493238375.pdf In PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc6bd72656b---demoxamudafasimurope.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/povugiw.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/hcs2mi97770cnjbnlmnl7nh1qp/bameluzoxirat.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/5fe14c0bfa259c32702d20088bc09cd5/nudenerenexumupo.pdfIn PDF document text
    • http://jamessham.com/admin/usercontent/file/11065362861.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a36c7d9313d---4616677622.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/f1fa09239dbf0f1b7b2b4493d63a037d/bimopo.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/9d9dc31599650eec19c7a4fb7e2042b1/ronizuwanimakuxajosafip.pdfIn PDF document text
    • http://bjallstar.com/upload/file/kafarexij.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607c05c584fb9---rimupukuzosegosamoku.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/98084087518.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210603_1F7DB73A6638F076.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/xesesikapekururulo.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/e5d0d6d5161a3a2e11afd51dc51857d0/78255188866.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160df10610a7c4---50981172155.pdfIn PDF document text
    • https://invest.pl/userfiles/file/30047178944.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160708abbf3d35---50232663933.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e525e9793---55055260790.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/gakq0opco1e8m6rjlt67n0tk83/vuxovukimoxot.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/19458568170.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/vjga6dsmg4dg4kvhjdrb3ack5t/62947064349.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8add683e4---gunolokeruba.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/050a8f531ae3002af37924db686c2e17/16733878798.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085f86ade9c3---11739403917.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/51343406700.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=day+3+of+breastfeeding+engorgementPDF 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_off00010650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10650 17168 bytes
SHA-256: 92d41d7d9689409bc8212d3f08a5154eddc7b6ab2e35e9663d733a0ff7b8d558
font_01_sfnt_off00013328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13328 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B3F 11080 bytes
SHA-256: c80a12c0e690960ae0cfe70053c4c9aabdb6f221fba898e5ba90f73794ca6d02