Malicious PDF — malware analysis report

Static analysis result for SHA-256 8930dad607b5144f…

MALICIOUS

PDF

85.5 KB Created: 2021-07-05 09:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e5366f07699bbcfdcf8db521fb1e0cd7 SHA-1: 1d8fad1ff3c22f7ebf3d4e0250cea5981cbf619e SHA-256: 8930dad607b5144f57d08e4bbdbc19b51ede3ef8c3d85885ada3fe4c5e1a5703
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 https://nomylo.ru/uplcv?utm_term=ar+questions+and+answers+for+harry+potter PDF link annotation
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1524f6829f---11867707006.pdfIn PDF document text
    • https://nevisnews.com/userfiles/xinevokepusu.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa09d35631---zemogazudelorotulidotojal.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/vraukcs8vipgvsfqpoortum1h1/suvudufuvava.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/41704960059.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/b8b84188f1780ad000c4c64c6b73470e/97671040402.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/36488908480.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/lovuwukowanawazu.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160984309ca5a8---57546470355.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/paxitoteze.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/0kekvughmltdg32ot3alidcdqk/17329376149.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088e3748bb23---63246202984.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fd412fbf6---74582433793.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082fdb2ed685---95124925769.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/da20f701ee8c01ea846f9d4455b733cf/jinogixejele.pdfIn PDF document text
    • http://aahsclassof1978.com/clients/b/b6/b6117739535924054831d33ecd54b00a/File/84688756405.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607278fc3b085---68762668026.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/f05743ceb8aa9c3bf30b5fde37869ae8/33945773260.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad92679e7e8---vukegoketefol.pdfIn PDF document text
    • http://flexicourse.cz/res/file/tezilufulogiradi.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/252c67ad17c1971be99fa300d0e94c88/zejusirelaren.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/79775597657.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8E 16064 bytes
SHA-256: 6be8c0c042521f5a71df7666660e0ab63b9e07567b17aa495b0122ea571483c6
font_02_sfnt_off0001029a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029A 17044 bytes
SHA-256: 984c7e27fa588e8fec5e870c7fdcf4f72cf1c5d0f4d3776be944cc933f29d3e1
font_03_sfnt_off00012ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED7 10976 bytes
SHA-256: 41d09cda8e99448c6a92ef57b4c77f75b0b616891c12dde6405cbeb6a64fb237

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