Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d53c7b8d0eeac7…

MALICIOUS

PDF

77.9 KB Created: 2021-09-21 06:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b48eca4672b54e37a0527c8773763554 SHA-1: fb6b1c3036547435b54ad33711d1f4a2af6dd782 SHA-256: c5d53c7b8d0eeac721128cd0769204b95bf55ef5dbeae909a434d2ebc768796b
164 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to compromised CMS upload directories and employing UTM parameters, suggests a link farm designed to redirect users to malicious content. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the phishing lure aspect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://chcial.ru/uplcv?utm_term=boruto+games+apk+offline PDF link annotation
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f93a41535d---91758434908.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/laponekuxusopi.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/mewapuveguzuzuwufuwid.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///40724500331.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/er2bsl6cd81vae5cb5atjvfsi5/biden.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/lisek.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/tunifudofilaboxokewuligo.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/xavalekoxijutefabofozora.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/10679506750.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/7582b1910d8c7fd5346ddee32d1f13e6/fometelufibofozezul.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/90039484201.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/4010877cddbccb6381c5597b9fdf568d/vagog.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/5d5c2d90815e5e7effc5d5dfb4c2cd87/renugagoziwumaxamopovubi.pdfIn PDF document text
    • http://rrarental.org/upload/file/39416878501.pdfIn PDF document text
    • http://ort168.com/upload/ckeditor/files/bedotemosumosefof.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/fojak.pdfIn PDF document text
    • https://stotex.rs/files/nanexubunawosagolu.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/74442912528.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/josotobup.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/detatexi.pdfIn PDF document text
    • http://synphabase.ch/upload/file/59848241013.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/duwup.pdfIn PDF document text
    • http://e-photosynthesis.org/userfiles/file/21399837991.pdfIn PDF document text
    • http://boldogelet.hu/media/88490248445.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_off0000ca46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA46 17852 bytes
SHA-256: 8ef4488d3e537a0f89d82e705e52d4759a8ca8f5ef93cdd604b4808e6b4ff511
font_01_sfnt_off0000f891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF891 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A8 10948 bytes
SHA-256: 97914cf800d70d02e34f9e1456583e148f246942b3ecd1f42286d8c71e333082

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