Malicious PDF — malware analysis report

Static analysis result for SHA-256 efca80cc0b44b87d…

MALICIOUS

PDF

86.1 KB Created: 2021-06-27 18:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 2274a7d96e7107692415346eb95a0a88 SHA-1: 31d668722b8202062fb88ee7618e59f184ed1cbc SHA-256: efca80cc0b44b87dfe6fcbbd77ced381dd5669b496dcbee965d35f48ef1a83db
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the document as a link farm on potentially disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c929d696f---65834889087.pdf In PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/kabilodejixa.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/615679b196b3604dab4f9a91ab3227f5/77689603132.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/29000574f2e9718f617ef67f2b317ec5/81187927770.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/uevmf6cjl2ekirdvr1s2dt0gqs/74176198061.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/nologotibukizezazagosa.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/qiaejlu6a98d1pvjvcp0qhmv3d/300559749.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/62005220801.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/18471558317.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/jupademitija.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/dumetomogekaregugefewigej.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609219f1583e0---4906556902.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/8262709418.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/e094c3c6dfddf2da0c70abbd449834a1/63970920838.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/17606317783.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/sogawasalagurefobab.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/35089167347.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/1847040132.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/28810183179.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/534809382184fa0ed38d8664f8a0f2d8/bubipigajeserin.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/jexisunutopat.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/subakemak.pdfIn PDF document text
    • http://dentherapia.hu/files/file/buwofedipupagedupotokike.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/ec010bec34aaee626ef32a8cde436ed5/zaxij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=division+using+repeated+subtraction+worksheets+pdfPDF 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_off0000e9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A7 11340 bytes
SHA-256: c46e3b96645b6d04b9ff3989411f372e7e5f2dfdcf03ba096da407b7c76f1c66
font_01_sfnt_off000103f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F5 17804 bytes
SHA-256: aee6778c9a1bdb58f8fe5ba1f10ebff185e7ea143cec449aed63594d03a20817
font_02_sfnt_off000132cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1