Malicious PDF — malware analysis report

Static analysis result for SHA-256 7136a7c6c6feaf6a…

MALICIOUS

PDF

89.4 KB Created: 2021-09-05 02:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ff836362b9b7788119daebaaa536839b SHA-1: 1142cfabdc7aa1bea2b860992de8c7f55c2573a4 SHA-256: 7136a7c6c6feaf6acf57f9e23d8b6af95ec2d65055f72f7c23eaa4996cf858cf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which are flagged as link farms on potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic firings confirm the presence of a link farm designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://gpe-el.pro/ckfinder/userfiles/files/57455832758.pdf In PDF document text
    • http://shuimotongyuan.com/userfiles/file/68051808519.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/82566223110.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/97920523727.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c955557d79e---nosopofojotiletonevusum.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/vogila.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/76eb1c585c384792c58d92f0962acda7/sutiruriduvawazuloros.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/f885dfd7b15997c7dd995e4d8f1c7584/bixudufobilakulute.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/e7e440d17be7d9473ce69e7ef6cebcfe/sowomodapinurewodu.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-2/20210502220917197608.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f08247efc3---nijanisisibefi.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/bejegeramogadux.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/loxoleduvozifome.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/susagolepefoxidu.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/42435514418.pdfIn PDF document text
    • http://hornets88.com/clients/56662/File/tagukiwesubileroraki.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/6425774340.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/48097032671.pdfIn PDF document text
    • http://cecev.com/stockages/files/gitepefileniburus.pdfIn PDF document text
    • https://aquatim.ro/uploads/files/3486571096.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a00fd2517---tozupaw.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/au0o3d6nhkhk5abpsrvuqk74c0/xuwidifofatup.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/tugopekixapigi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=uji+normalitas+dengan+cara+manualPDF 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_off0000fb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB59 10952 bytes
SHA-256: fe66245489f033589759f9064329201f9eabfd266b90cccd1b2baf0dee28c56d
font_01_sfnt_off00011479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11479 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8B 16644 bytes
SHA-256: ad9409525fa5d117be08ccfd4594b6ecc1418b50a68327558b1a7b43f4c8a5c3

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