Malicious PDF — malware analysis report

Static analysis result for SHA-256 6853ec267964f8f7…

MALICIOUS

PDF

77.2 KB Created: 2021-09-04 10:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 69fc3d8e14e3d529a712c9d79eed280f SHA-1: 4c8be3c31d07e9edfe3d340ef16e314740eb373f SHA-256: 6853ec267964f8f724e47c397d62d5eb87db4424fde5f5a9e8a08f867420849d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised websites and disposable domains, suggesting a phishing or malware distribution scheme. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://medvor.ru/uplcv?utm_term=thymeleaf+tutorial+espa%C3%B1ol+pdf PDF link annotation
    • http://langeline.com/ckeditor/upload/files/mopawemuv.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/xosukefeliletinixagazakoj.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/22884527701.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/49395043576.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ca05f59aa6a---motepedufegofexamomebub.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/ditetetizasuduwigigezi.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/77736273512.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160fdbaf23c5e9---kezusefewototepa.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/e2c7db9946e4984d062132932a395506/lepekivure.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b40ba8b98ba---kusuposedusatonek.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/gadupadowumutezuporan.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/14bafaa9ef5a233809d05a88686d5896/wavobita.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/xuxisepiso.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/98490602088.pdfIn PDF document text
    • https://signika.pl/Upload/file/nugajabuwu.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607330b8c82d0---36015371486.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/25489487237.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/rivevixurusadanigomumiwof.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/90355195397.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/l55ng31vu6i6ejril7i0mlmoc1/gudopenasanulo.pdfIn PDF document text
    • http://cpviettin.com/upload/files/wapubanatexav.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/facb5332e3c349b63674bd6c86c470f2/zidolaxamu.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/jlugo2l2v2ek416s59ikojd5v8/ralopuxufo.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/9977617230.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/topenusa.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/db1735199a43e0f9cf822dddf503c973/renediwubusizas.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_off0000c3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F8 17800 bytes
SHA-256: 90739bd0261f2c0b7f9b61148fbc7bfc0071bb08e0049140389da97c64eec723
font_01_sfnt_off0000f326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF326 11040 bytes
SHA-256: bfc0f5169955576cdd2a8c5aa3ca600e365de09b248c877d4e7deb91520d1358
font_02_sfnt_off00010ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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