Malicious PDF — malware analysis report

Static analysis result for SHA-256 95d44799e69bf2fa…

MALICIOUS

PDF

91.4 KB Created: 2021-09-09 17:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 473f6831a823f4bc0aba11efdcce0cc6 SHA-1: 7c969b51bd146e85a169deb44ae5d94079841100 SHA-256: 95d44799e69bf2fa2cbc23ee3b390b61fb5132aae343b6e7d8ce7df4f2be4690
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, such as 'https://pixomot.ru/uplcv?utm_term=english+11a+final+exam', are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://pixomot.ru/uplcv?utm_term=english+11a+final+exam PDF link annotation
    • http://christ-china.com/filespath/files/20210906135122.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/75830019164.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/fagekupufotesaropufo.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/zedasupodise.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/40528702282.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/69715405569.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/60767485356.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/86916789967.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/5959582171.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137a3af1655c---pazipowezuvilududanobe.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16138ed9f96f3c---77871535974.pdfIn PDF document text
    • http://dasbluemchen.com/52428170762.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/83479307627.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/ragedobopitur.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/vejikirurimutuma.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16138e154c3fe9---15315784073.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/45330766118.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/kidiramenipajorefexilipi.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lj1l4tach55ncp5ae8ogg7q3e2/73033674480.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/19146596121.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/cjee80j3gfjo8borjdbss3l1du/86210648879.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/zatipilimavesibemedif.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/poxokaxotabewawesev.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_off0001018e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018E 17772 bytes
SHA-256: 0ca3ee533b7e0aced2ebe9f6e6dc6ed15911eb77e9dd90d51b5ba15bcde2a3a6
font_01_sfnt_off00013050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13050 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14867 10480 bytes
SHA-256: 73856fb20c63e5ee45b8b8afe019b7502077fd33c6d2d8f5bc1842b592305bf3

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