Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c9e551ad059ee4…

MALICIOUS

PDF

92.0 KB Created: 2021-06-17 22:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f5854de5133e428c2d7c00e444a50c81 SHA-1: e55fe24cb6c1f50e27aa772bb23a64114d2ccb0b SHA-256: 98c9e551ad059ee43e26df90a750c5964b3da04ef99e63247c7dc418736881b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicative of a link farm used for SEO manipulation or phishing. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of these links suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/f285cb805d91f5825f5acefbb3732b36/ruzotopepozedafi.pdf In PDF document text
    • https://betenrealestate.com/sites/default/files/file/80931403658.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f63c803712---judeza.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/3c273fb4168d2f58dd9d7a14338365e4/37409012744.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160c75d8c21b0e---125683860.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/43941549354.pdfIn PDF document text
    • http://gptools.net/userfiles/file/vikiranosesixaxodo.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/72592919085.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/lipari.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/3317055643.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/7229471409.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160817eb79ec5a---53908591892.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/01f94bc7d50357ada6b9c69d9a02574b/63445327070.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/sanebenokakov.pdfIn PDF document text
    • http://www.asslar.de/downloads/47777400990.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/1ed58a922b6c40668a44fa56ee035d6e/75206906310.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afd65ee48c3---23262963393.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=nfs+underground+2+tuningPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12752 4936 bytes
SHA-256: 13df9ccb1b5b7161c1413738becc1256567f7a9d1d62c8fb45dc7762fce9e03f
font_01_sfnt_off00013836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13836 13388 bytes
SHA-256: fd5dc3cb0865889f740d78680face161541f9d8b49c9aec72cb2f4b761c4e74f