Malicious PDF — malware analysis report

Static analysis result for SHA-256 286600d4407f2cb7…

MALICIOUS

PDF

95.2 KB Created: 2021-08-18 13:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 82f9527247adb03efcacca96052fef8a SHA-1: 6327515b1c8f559ce52a07851ffe8c653e6c482e SHA-256: 286600d4407f2cb710211f61e349bac7f167fbb872419fa62c7847820a909072
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to compromised websites, indicating a phishing or malware distribution attempt. The PDF's structure and embedded links suggest it is part of a link farm designed to redirect users to malicious content, likely exploiting a vulnerability or attempting social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/qg1u4ujs7k3k14ge0v3biskap0/44077861993.pdf In PDF document text
    • http://arohitourandtravels.com/userfiles/file/wewazibeguzuranurorise.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/40423556859.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/54532958716.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c35ba766d99---gobuvemimik.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/bmtrg49h851mjqg0p1mg6javrl/nemagipevexozepig.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/26385376833.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4575646b28.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/lobupu.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe8341b5456---wunawunoxojibotet.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab0d5165aa---nozogozupilar.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/47400176091.pdfIn PDF document text
    • https://auto826.com/uploads/files/tanalu.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160eddb8ba4083---kigebisawibanubatusij.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/9ddea4g4unvehpn3irihmhmq0c/vitigix.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/28643055351.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/87172299373.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/78745082074.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/5e6ea29f2057c79da6a62c80ff59349b/tiguvevotusedomizejixijof.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/73706216724.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/gudugerigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=will+arctis+pro+work+with+ps5PDF 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_off000110aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AA 10540 bytes
SHA-256: 75e85fd26395b8a790171184d91206785b58a13826af5f539832e3584a086b45
font_01_sfnt_off000128f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F0 17928 bytes
SHA-256: 61014b09eb72c3594af9ea39cad0c47bbb93ef0bd483e6c529372f1f624a91bb
font_02_sfnt_off00015794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15794 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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