Malicious PDF — malware analysis report

Static analysis result for SHA-256 868cdf46cd5d7705…

MALICIOUS

PDF

82.8 KB Created: 2021-08-18 04:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8e80a333dedafc8509564dbf1b1f818b SHA-1: faca8e3affed78ef56e64d46d9e16915fdb86f9d SHA-256: 868cdf46cd5d77053ebbe29b2ed9d2984b593ca710ab069b9caac372db5ffd23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports its role in directing traffic to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/6a8881b9eb251e81938119e14a80060a/53287719944.pdf In PDF document text
    • http://staractivecollection.com/resimler/site/files/gugovemibakufodagasolu.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d9e5ab1c1---biworapafekazeloza.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/5td6e5tr6i8pnn3qbdjga1fgp5/xumimulako.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/vikutuzufebozizovon.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/xikowiw.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/rilosomab.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/74580006719.pdfIn PDF document text
    • https://mytopics.it/uploads/file/kobetak.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/puranilakowalagolem.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfd8b44508---41598401392.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/mitinivomotadesux.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/sotavozivukonesagofi.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8720a3a74---pozovurewusudiwikebomo.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/39208773387.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902b575d521---lexemadejarafa.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/84450525907.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16100265940606---xupimarigotijigute.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/87376443936.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/tipexege.pdfIn PDF document text
    • http://maxkbm.com/clients/2/28/28fcaa936e2ecbeb6c9a97ea0f1ab253/File/82661033696.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///petotozijoxezafiganaj.pdfIn PDF document text
    • http://stattus.com/assets/file/getuwanowurotuz.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/87461bcb93dfbb16fc2098208eee1742/77520085448.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/47578878477.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/majozinewabewuxaloropa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=holland+america+signature+beverage+package+2021+costPDF 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_off0000dadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADF 17508 bytes
SHA-256: 57e23b598feb253112d7617c22e7fbbd1614c0fda5d2e26d829eafd9db00ae06
font_01_sfnt_off00010880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10880 11540 bytes
SHA-256: ad0f4f95dc00d573a080e149826c8c4f1dffb24dd3ce59702241bc7b039c44dd
font_02_sfnt_off00012374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12374 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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