Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cf83b22161ab341…

MALICIOUS

PDF

76.9 KB Created: 2021-09-11 19:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4e19820ca1e4330dd112ad83747a8584 SHA-1: 02bcc9fdcee624e1ca23ee4d5e7ef0e0163944c0 SHA-256: 7cf83b22161ab341cdbf5c2360fca4cd415609c77e743e87d8f81f7f5ea776f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ueros.fr/admin/ckfinder/userfiles/files/binotalanigonirejuzojovuj.pdf In PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138a7dce850e---47463258696.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/vofupiloxezugivorusozu.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fa9a6e6e1---mexix.pdfIn PDF document text
    • http://iucecb.com/files/file/22389398634.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/5824584376.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/61903554290.pdfIn PDF document text
    • http://sieuthibds.net/images/files/40003520465.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/webexowogitugob.pdfIn PDF document text
    • http://greenbrier101.com/userimages/34917561545.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/36049916660.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/texudovenopakam.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/xavofuluwimepagogiva.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/fujiwiz.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/62602370417.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/wamagasadamariru.pdfIn PDF document text
    • http://sql110.com/pic/fevejurudalajopamaluvabi.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/e1h2imsagnk51du70885hvg9j0/95980642185.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/23011744934.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55545370887.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/tolopiposin.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/peruzob.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/95217392940.pdfIn PDF document text
    • https://digireg.gr/upload/57617024503.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/nawazavabepukeraze.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/39516228009.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=leo+play+card+apkPDF 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_off0000cb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE389 16912 bytes
SHA-256: b97d3277e711554335df2b27b195b9a022c8fdab93ed9337bf3885a1defb8d34
font_02_sfnt_off00010ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC5 10208 bytes
SHA-256: 2bc0a34e0e7942a1357458b4a5e9b8a9dafa9c6a3788d42a93ece24ffd7acfcc

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