Malicious PDF — malware analysis report

Static analysis result for SHA-256 6452becc5b1ac2d9…

MALICIOUS

PDF

78.4 KB Created: 2021-09-19 14:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e14a8f9e80a8f64b83fcfb4d3fa21dbf SHA-1: 542aa550be281d7d94cbe7efa7464a85599be141 SHA-256: 6452becc5b1ac2d9000bbe9abe998c1c595cc587c0dcd1fb8c78cac3fe8ac5fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, pointing to compromised WordPress uploads and other disposable hosting sites, likely for phishing or SEO abuse. While no scripts were explicitly extracted, the nature of PDF-based malicious links often involves embedded JavaScript to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://kukdae.com/files/fckeditor/file/1952165889.pdf In PDF document text
    • http://runo34.ru/attachments/file/tuxatulajodowaxa.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/xofupakusotez.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/woguludazeze.pdfIn PDF document text
    • https://dafelia.com/files/rifowunu.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/wexaponapiruzobo.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2b9585fcd---wavudazovol.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/xorirudafomubevaxaj.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/51032025249.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/2bd3791e43f67f328a8c8180c1c5b6cb/mewurokavopozidatakug.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/c4ae16cdc3bec8707eaac335051d6e34/53596078965.pdfIn PDF document text
    • http://pioneerbuzz.net/userimages/lufinox.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/52950666676.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/pimoka.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613924fc3261f---37926178124.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/buturigolivutuxelijin.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16136824610da7---daborobivulupetiputusepis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=japan+rpg+androidPDF 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_off0000cfcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCC 17840 bytes
SHA-256: 457175230cb63351d324342177a957feee2f767c5cada46b4abf766d577f3e38
font_01_sfnt_off0000fe4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11663 10112 bytes
SHA-256: ab9917e87f5aa1118bb7d8d43ead07eb123bbc34f47398d69ef3c4d944d3399a

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