Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed32e35d63a59ddf…

MALICIOUS

PDF

77.3 KB Created: 2021-09-03 13:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4f753b62e2487d97152664a735ffdd3c SHA-1: 673a8f290420a5a5e57c56f21ec13f4974d95b78 SHA-256: ed32e35d63a59ddf76f423af04d7a0ffaa4b208a1c89eb14af6af0b3221f51c6
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to other PDFs hosted on compromised or disposable domains. The primary attack pattern involves luring users to click these links, likely leading to further malicious content or exploits.

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://cuadepthanglong.com/images/ckeditor/files/34466547914.pdf In PDF document text
    • http://d-innovation.com/upload/files/fobajizul.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/29427b6e865c761ef48995fd57426f11/bufavibinevijow.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/kimumirogejejujalula.pdfIn PDF document text
    • http://shriramashramps.org/userfiles/file/kesamekekipawovuzop.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/vafolese.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/31922c4e7ec8bd4696e8339a337fe567/49288520962.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d44102f32---95545050998.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160d6dd3eb1bce---36944651353.pdfIn PDF document text
    • https://panama4d.com/contents//files/57098390340.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb60a0a74c---nifigopiferapexuv.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b9b420c84---vitikewukerep.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/foninanekezareme.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/449604f2a41cf6b29a1f2ec9df022f44/71212829615.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eda79a9f8a9---52890496940.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/ndp6r8u7r39f070gagcj5neek6/72200373575.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/wadivukemikuxeg.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/15248275796.pdfIn PDF document text
    • https://arerp.kr/data/file///nizukikekukikow.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/5dd5874bcf31f0bce6cf07827393d5e0/jagulenonikodujo.pdfIn PDF document text
    • https://andana.us/files/files/96906798140.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/79560903751.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/dumanuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=search+pdfs+for+textPDF 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_off0000cae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F8 10652 bytes
SHA-256: 483058fc1e2a7e112bf69ab3760d135b4c93671b17c3a8ae10de59e3dec01384
font_02_sfnt_off0000fb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7A 17360 bytes
SHA-256: b0946020e07fd2e270f0a310b4d173591690fd85dc3153a378a8651b71fdff63

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