Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d7d55549f36f41f…

MALICIOUS

PDF

81.7 KB Created: 2021-09-08 03:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ca8a1e0590aba9766ee639fc255e8829 SHA-1: 2486e61f3cda9b66e0783aeb7683176495a91bfa SHA-256: 8d7d55549f36f41f9f45538b78a0fb249105753b22676729385e7443a8e97aaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of external links, many pointing to compromised WordPress uploads or disposable hosting, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://alternatifmedikal.com/img/userfiles/files/lenadivifobedajuguni.pdf In PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3d31823a8---45666629337.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/seketasepibomu.pdfIn PDF document text
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/neximanegedixovapotalu.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160972e1a27f33---pizobotipuvizore.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/a0ef3799fd403e8556245d89ee3c0b59/67217449115.pdfIn PDF document text
    • http://kleiberit.ru/files/file/60690195188.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/tosisirero.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/pijopisopumumuduzijaje.pdfIn PDF document text
    • https://service-panev.com/userfiles/3899399154.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/47790977087.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/fupez.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16073165e9e407---fozegulikewujowejataxumer.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/genutoloxofaroti.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-7-7/20210707194334398920.pdfIn PDF document text
    • https://namlongadc.vn/uploads/news/files/13460972900.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/pipuga.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/71066844209.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607431d8a21df---simetofunafifonidisi.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607589080b313---24118212387.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/xififamiwuvumotoleviki.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/f24c618721e9f43af749f777033fa999/volenefedevegubiwabimo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=advantages+and+disadvantages+of+mobile+phone+essay+pdfPDF 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_off0000dade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADE 11148 bytes
SHA-256: cec6fc64382d82a2bbe407c567f697774da5ba8a5144ee89e83c3c98eeb8e3b1
font_01_sfnt_off0000f459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF459 17316 bytes
SHA-256: c8bf10f07b74c86ed3299c129aaa6fd761fbc021c7bde8b436b31991fd17b69a
font_02_sfnt_off0001211c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1