Malicious PDF — malware analysis report

Static analysis result for SHA-256 68f75efc578bfc72…

MALICIOUS

PDF

84.6 KB Created: 2021-07-02 17:41:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 179e8693907878073bb822c77770ba9b SHA-1: eaef14c72149c6f0ba5a56a6ed564dd84723ce5a SHA-256: 68f75efc578bfc724d96fa7071a7fc6b07ea2ee9e6316336f1083e33be67fabc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, specifically targeting their file upload plugin directories. These links are likely used to host further malicious content or redirect users to phishing pages. No scripts were extracted, but the PDF structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fea21e504---86184548330.pdf In PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/38342a8a75b058b9c0cff832d9b2bf4f/85762595413.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160812db575dc5---79438228532.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/7f7bbd4baebaaf735722bcf4b5841883/xogudefanut.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/36121046823.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/bf0847a904ad81e4f7a0d889a5f3b2ee/kuxekidafetunulupowilolu.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/a0ad437e78f0b07164b579fac59026c6/46014084146.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/37774b58300830fbb805aed8cbfcaff6/kimuvanenifewikadozano.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/c9k5omur0fle6t5in40eonekt4/dubukomuzazelurulekiri.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/15963061049.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/dadokijujawidukiw.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/8c5bd7e953f10be2aae85a8a20a4646f/werifurututunebit.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5eef008bf---56831794360.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/b44c886bf3ef235898d3ca585801bd98/pafevofuxoxok.pdfIn PDF document text
    • http://acgroupenterprise.com/userfiles/file/kiluladepupozi.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf06460659---14320749216.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/4718107324.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16083280eaec1c---77155343556.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/30586196954.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/32390302503.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/dozipexofaje.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/80683075068.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=speed+of+a+transverse+wave+on+a+straight+wirePDF 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_off0000e645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE645 10960 bytes
SHA-256: 8a1b8768c05044b8875daddbe46ac016cb02203eda2750389eb9f938cb9de0dc
font_01_sfnt_off0000ff79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF79 17260 bytes
SHA-256: 5d0e218c117a55af1e3bd1392af6c7269d018c1e66c237a85b3977687eb46748
font_02_sfnt_off00012d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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