Malicious PDF — malware analysis report

Static analysis result for SHA-256 d617241e88ccea43…

MALICIOUS

PDF

79.6 KB Created: 2021-09-23 14:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 22b3b464a263df7b1e34a8d95d23fbcf SHA-1: 4b07b7c29e654ebe65cb2adaf17f06ed02401be1 SHA-256: d617241e88ccea43f2c516eaa9e3eeabe18408f4f5b943dddb336bc8a3720ff2
164 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links, many pointing to compromised or disposable hosting domains. The presence of a 'download button' lure further suggests an attempt to trick users into clicking these links, likely leading to phishing sites or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gzmzwl.com/Uploadfiles/files/letuxeligemurad.pdf In PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/vunerufejepolemimavarekup.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/25634581039.pdfIn PDF document text
    • https://esz.jp/img/editor/files/63675659626.pdfIn PDF document text
    • https://atrax.hr/files/jupakuvujosikobevazud.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/25044201275.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614609632c8f9---67462436786.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/c171b4960516b7a62235a199ef56b939/pusavaxofomen.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-4/20210904011544597842.pdfIn PDF document text
    • http://nyt.jp/p_images/resource_library/file/semugir.pdfIn PDF document text
    • http://bluebossa.pl/files/file/25679991398.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210903051135.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/42650859310.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/86532434616.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/bufukimanukasajusezipama.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/jorivo.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/xitikirazapeziwusabirulo.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/roxixik.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/jevanoxexefewonaximu.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/tuwana.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161491d7aba412---90723825910.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=ld+player+emulatorPDF 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_off0000d30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB21 10360 bytes
SHA-256: 3f04306e264c7c38b29e01e6005a6fe4f717f8b28c56fcab4aa5b9f18b3c2e06
font_02_sfnt_off00010295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10295 18300 bytes
SHA-256: aac2ab79195b185171cc588b3c6eeda1d784846010fb51231dbe926123419f30

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