Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecc699f1a0a08c37…

MALICIOUS

PDF

77.1 KB Created: 2021-10-07 01:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d6ed21b0ab1395770bc394da3f2db728 SHA-1: 24ce8330e378695353a944df0e6e594773bb7c87 SHA-256: ecc699f1a0a08c376b481a1e46708ef7a95be8a1addac90dfd7710c7149324f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the link farm and the detection as a trojan suggest it's intended to facilitate further compromise, likely through user interaction with the embedded links.

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 http://pozitron-s.ru/userfiles/file/52033845932.pdf In PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1614bfe8b7cbbd---volabebimesizoruj.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149a787e3e60---55537731246.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/retot.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/87275803494.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/bokikatiwadola.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/qal8s8fvcmhjlqv4ffgqk572v2/sinetu.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/fef0b86f4e4739d6c6181bf3b701d003/70035744044.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/65578259806.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/mibesatodinutofe.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/1457534242.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613273f70c1ff---68279608622.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/79128290618.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/tomugipumunabuv.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/5t4qjss313snqvoesvoobhiplg/zukanamipimonese.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614546b29a1df---40102525003.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/19094706780.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/warowexuw.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/43297224014.pdfIn PDF document text
    • http://gemtown88.com/PicOther/file/gerepub.pdfIn PDF document text
    • https://akconta.com/uploads/files/toxekulevu.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1615e0ecd320c4---nizafapivotemaxew.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/85a35b3ef255b2cc7292716bd14c6d79/wuwopon.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/zubolalevedowo.pdfIn PDF document text
    • https://jurvamartin.com/userfiles/file/renezowevajuzusewar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=first+5+natural+numbersPDF 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_off0000c97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97E 10500 bytes
SHA-256: 3d9cbd4d880efd789915fc1e987dded573d5d73fc2b2e38cf9cb7b0c31c89b3a
font_01_sfnt_off0000e160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE160 17664 bytes
SHA-256: ffeb39c81973e7505c089eb83ef26e648ff40e38c3a7574487072199f3f5a436
font_02_sfnt_off00010e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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