Malicious PDF — malware analysis report

Static analysis result for SHA-256 6afaea968ce58fb0…

MALICIOUS

PDF

84.9 KB Created: 2021-09-09 00:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9bdd0a1a20575f4394c8e585b5c259c1 SHA-1: 5826b202302dfc37e4e7c41feb7da83bad40a33e SHA-256: 6afaea968ce58fb0c39df4e6d2b615178a99813dd740fa602a3493e9a489388d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16130a5221b1b0---xanine.pdf In PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/60892168798.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/jirunegosu.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210909050259.pdfIn PDF document text
    • http://dgone.kr/userfiles/file/20210901182523.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/fajase.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/wifamapope.pdfIn PDF document text
    • https://tonitomov.com/picture/file/wovinatinuselekino.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44567137473.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/68591944126.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/70125018996.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/46783171360.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d26aafd52---ziwoxeduxafe.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/4665267729.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/44968294952.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/96934538270.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/lozunasafuverewe.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/21271043408.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/14029510376.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/vsl8jh569nugfoqo0k914nmt7u/93082923697.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16135137842.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/f58321fcd0eb73dc9a7df6182e4e257d/tuvum.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/niwipixal.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3513d15d50f85755ed1e731a59bd2f37/vatojokosu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=android+usb+drive+appPDF 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_off0000e800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE800 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10012 18044 bytes
SHA-256: f17a87e5acbf8149fc5d96f0508fff0f0d631e1c3e1c9afd661d2d76978f6b9c
font_02_sfnt_off00012e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E02 10528 bytes
SHA-256: 02130e9634da2b9655fc4d81e3006fca6dfede5a6aeb257425ee89a9a04e2042

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