Malicious PDF — malware analysis report

Static analysis result for SHA-256 79f4a4bc363d66c4…

MALICIOUS

PDF

101.3 KB Created: 2021-09-01 04:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 452cf72697d369bf10fca7b298d160bd SHA-1: e494127078adcfbb72adc494b46a2caed6acec95 SHA-256: 79f4a4bc363d66c46c38f4686a5882b9f48fe1fdc28e2438d941811458f43c3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://chcial.ru/uplcv?utm_term=famous+female+astronomers PDF link annotation
    • https://tylbm.com/Upload/ckeditor/files/79324901541.pdfIn PDF document text
    • http://adveotec.com/img/file/depizumaj.pdfIn PDF document text
    • http://debden.org/userfiles/file/zomaf.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/94612082428.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/82220748390.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/bfsi94hq2ien0466quhuve3hvf/32457351841.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16110429ed19ee---85319919878.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160923c688cfd5---rajobesagigugofopores.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/96889327157.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/376877f0c3862080f062422242482d63/7950765546.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/2889p3s5h4m61d038g9q1koe87/zevuxudinago.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/eca2aef38665429eb22f5460f2aaaa08/12179730419.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/kogufonope.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/f4c06e99a80c714ce1413d403056ee8e/bupadaxofareduvab.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/tikakoxobukijupuvutaxofu.pdfIn PDF document text
    • http://csss77.com/clients/d/df/df7f2fdc42e243c7a03c192a8228c0be/File/47172524857.pdfIn PDF document text
    • https://birotex.rs/images/files/bonusanorofigizesi.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16077c687d9fc1---gexowuvabesujevezegurek.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/24627499120.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210706161209_1nsrrd.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/92568836914.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5c383c5ad---25588924351.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/eq7d0p3j0pjalsa1mlvcbnsuvb/vevejajibufizefomad.pdfIn PDF document text
    • 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_off00012745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12745 10360 bytes
SHA-256: 28df179b7b576c403e3e1abd612a8e6d8e83334b6e8da73659191bb266f97490
font_01_sfnt_off00013eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EB4 18444 bytes
SHA-256: 08b95a3fc89ffac907e1b7c589424684eabb60804a18088e1e79fb73292de7e9
font_02_sfnt_off00016eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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