Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9efdad213d3274b…

MALICIOUS

PDF

75.9 KB Created: 2021-09-05 17:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d8f43ea40d783083aae173e1ae9d7253 SHA-1: f0c8598e82d8f947d06b0b0b2693b8569a0c885f SHA-256: a9efdad213d3274bf8c4e701d038f9f5a1e67f80baec7c9b2c3da3f1640fa51a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://inwebjor.ru/uplcv?utm_term=seguridad+e+higiene+industrial+pdf+libro PDF link annotation
    • http://quick-thailand.com/images/uploads/file/62956385654.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/90988976947.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609833482d1a2---1968853838.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160be60b36c76b---21435918423.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/luzolipujupuneg.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/fokamowerokimenujo.pdfIn PDF document text
    • https://langumeistras.lt/i/File/mirekazisetezogodegol.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/lanofozux.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/ad9368b12318babb3de533f0f8d080ad/jefejavuwepud.pdfIn PDF document text
    • http://sy-smile.com/upload/files/6275531012.pdfIn PDF document text
    • http://accu-chek-event.com/ckupload/files/refosimavuwajukesit.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/94722989506.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/6ab8552b85ff20cf16866e9624a43df7/lonokaranexoma.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/25538123073.pdfIn PDF document text
    • http://thaymanhinhlaptop.com/userfiles/file/12890028576.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daeae9d9b52---82310660548.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/8jluh64fri1qqfef8mfma7il1v/34026527239.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc45c8a823c---wunewu.pdfIn PDF document text
    • http://asahiru-ban.com/files/files/65403114757.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3d4aacf95---fejirifowamuw.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/sudowojetovazofapuboxenoz.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c795ca9a544---62792836454.pdfIn PDF document text
    • https://alohasafaris.com/files/fukiz.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/16669620375.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/zuwebab.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C6 11092 bytes
SHA-256: e43f597c7c542af6467f1d78aa3e5ad3d3789c1f960bb4693b14a1cf0a9b2dff
font_01_sfnt_off0000dc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC12 18080 bytes
SHA-256: 80f99f53c42ad31945a0849fd724ad87eda244084d6f76faed762344be997d98
font_02_sfnt_off000109dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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