Malicious PDF — malware analysis report

Static analysis result for SHA-256 be6410312872477c…

MALICIOUS

PDF

82.3 KB Created: 2021-09-12 10:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b60e69af8a10427fe0d9b204134f1904 SHA-1: 54078b93756c24866f86a4685105240afb9a47ef SHA-256: be6410312872477c41a8fb6255d710ddf90de06fadad3c6d0c0edaed9ffc95b9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=fast+and+furious+watch+online+free PDF link annotation
    • https://matagujrischool.com/admin/imagetemp1/file/jopezezovofilosexe.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/tekiratuvuzowodalekakega.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///97589444422.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/92112205852.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/24176972801.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/fegidipakafusugimesexepu.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/velozuwufurobijifopegu.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/88629134277.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/55623773635.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/dabozimajabevasib.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/18761028317.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/33239139781.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/vabot.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/59712500527.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/tuxidudutumatemodir.pdfIn PDF document text
    • http://matras-devison.com/upload/file/49568732360.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/96066862869.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/lukubifinelolelazaxukum.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/jabafewidudotaxededixid.pdfIn PDF document text
    • http://ladna.pl/user_images/file/11828564748.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303f080d336---mixelezuginizuvovetopim.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/696ed97b014f926ac80886278cd19a4c/76476203699.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/tabakuwuz.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/68353717249.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c048945062---lirekonaleguw.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_off0000da56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA56 10736 bytes
SHA-256: 939d04993e46aa974a9194b598b96a47da53820a4ae5c3e7add0dd1c60e4ee73
font_01_sfnt_off0000f2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FE 18520 bytes
SHA-256: ee9f38e68a9782a6f93aa2b70098d754c0906d670923ccef169803c23d8d4e33
font_02_sfnt_off0001239d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1