Malicious PDF — malware analysis report

Static analysis result for SHA-256 effb6fef7554ccf9…

MALICIOUS

PDF

108.8 KB Created: 2021-09-02 07:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 11b27c3faefbfeae95107d8f49cb8c19 SHA-1: b86ec2e3889b114500835dc3d4fb9ee0942892f5 SHA-256: effb6fef7554ccf95070cafb1c6ad76a9148e3bf41a85066c51af0f53cdadcf6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The primary goal appears to be directing users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://coretry.ru/uplcv?utm_term=abraham+second+wife+in+the+bible PDF link annotation
    • http://bacsionline.net/userfiles/file/revusu.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1606f56e0d16f5---78193758794.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/0bc1719c42f44e92ba97417e87f123cd/jijipokofinopinuno.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6f28f38325---5854240923.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/surenetidetopil.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160836ae9a93a2---motazajosupukawexukezib.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/4916114121.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/vokafetegokatemedoduwe.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/39829928733.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/godefamigevu.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/polubajurufume.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/fixated.pdfIn PDF document text
    • https://solo-enoant.com/content/files/files/nibekibofubo.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/008b2b8af5acea8dff5d9649c98f6164/43325751666.pdfIn PDF document text
    • https://blv.by/upload/editor/files/wejereratijetamebilug.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/45050593288.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/68770952918.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f35baea36c---begajiwosawipuwaximijudif.pdfIn PDF document text
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/litadumelaxetozevoke.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609bde1b56a0b---39520778686.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/80684223260.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbebb55307---varulesalanezu.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/fekova.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/55137667030.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_off00013f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F05 19724 bytes
SHA-256: 98ae83274e796cd7a06fd36b7c7e114f8bce36e3e44c685a0d7bf33cc622b9c6
font_01_sfnt_off00017193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17193 10948 bytes
SHA-256: 07f6524eb290d9aa1ebf48d9ea7d7c27b65e863d58bb801653a73decea6c3702
font_02_sfnt_off00018ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18ADE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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