Malicious PDF — malware analysis report

Static analysis result for SHA-256 06f1ced3d8d514ee…

MALICIOUS

PDF

74.7 KB Created: 2021-09-27 01:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7e9fc4fd5b149c89ed6c0b93e1f92b33 SHA-1: 9e4182b0ecf715555527b4c8dcf928634b3fcee3 SHA-256: 06f1ced3d8d514ee6d2d67984c32677356c841691c9d52c938f317f63f3b4f55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://krisoc.ru/uplcv?utm_term=nexus+10+custom+rom PDF link annotation
    • http://goldway.jp/upload/board/file/10905221712.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397ecfca148---39459676728.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/zuzakixixamorizuwixukena.pdfIn PDF document text
    • http://myphamasia.net/upload/files/gurizejaxavekisav.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/redusekaxejadex.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/32048158021.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/tozevugixudak.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc054c294b---muwoz.pdfIn PDF document text
    • http://kcwoman.medsoft.kr/pds/userfiles/files/1520197599.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/26795142763.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbffd34bb5---85303922868.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b399c92a56---25370537844.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/6b09c6ccc42906339ec6edce65ca32c1/98569288808.pdfIn PDF document text
    • https://ever-progress.com/upload/files/lazalajirufawoturi.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/vavetanorizod.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/dokuguriwozumowabaxosukan.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/zijusuxixasuvilaniga.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/91229308129.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16137e6e2d5503---muwivutizazoz.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/rabevobafigemidajepimu.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/68169302029.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/jelawunimo.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/30d22d775dac6115ee7f7415e3b87bc0/11905445266.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/00dcb9h6qo25u5aurpc8jk00p3/govoziv.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_off0000ba68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27A 19640 bytes
SHA-256: 1f100277a122884a116f3451e01b836e822b924fe2b4a14bdc2a5b7ae435db47
font_02_sfnt_off000105af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AF 10340 bytes
SHA-256: b00a74a43e5397b47635e4f542a24ed0b55ddf3f43a3c61ff48501a1bf7fccf3

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