Malicious PDF — malware analysis report

Static analysis result for SHA-256 4facec739e8a4e78…

MALICIOUS

PDF

88.6 KB Created: 2021-09-20 01:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 07310c99cc3d42e9ee21d5fd660ffbb1 SHA-1: d6b2a64f3d81b9c54167fdd95364b6679cc42b56 SHA-256: 4facec739e8a4e78eefabb27c9ef321bfcc247d4215f9b8aaa4cef76381e5553
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, some of which are hosted on compromised or disposable infrastructure, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://chikatere.com/Upload/files/guxiwufewezokaze.pdf In PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16147b44e105d4---bakizewusop.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/toxowomazodenuto.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/fepijuzevajatekula.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/fa405fc5a8a933193153d45508bacebf/bigasu.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210919_020159.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/dufetorovi.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/rivovan.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/90641130357.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/3918066208.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/komerakofame.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16145461dc543a---39868816580.pdfIn PDF document text
    • https://angem.fr/userfiles/file/rekadalan.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210911033116.pdfIn PDF document text
    • http://atya.eu/files/file/sovovedoxap.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/birokuzuzadipux.pdfIn PDF document text
    • http://houselandia.ru/files/vidaxigemedalufemonibuvo.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/dfhtulciuggope676qg8oso663/wunaxikezujiguk.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/77126341241.pdfIn PDF document text
    • https://linker.tw/files/foperim.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021090112125680554.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/sugawevofemojevo.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/38187844939.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/33589343459.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/11358725648.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=torque+pro+apk+2021PDF 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_off0000ef68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001077f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077F 10332 bytes
SHA-256: e362363f01bbae07a1fd5976bbf8badac91c67c70f7c625d5ff00eee009e87c1
font_02_sfnt_off00011efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFC 19868 bytes
SHA-256: 651fa466fb0653dbe8dd05ef8c28827b9cc41dec5b31af7f9c532b3ab3ccbc4c

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