Malicious PDF — malware analysis report

Static analysis result for SHA-256 64fffba11cb9c6c9…

MALICIOUS

PDF

92.4 KB Created: 2021-09-01 07:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 70963fe34cc23c72104b90083db56487 SHA-1: a44f57cc560fde473eebb2d5a3e928c3d0f67061 SHA-256: 64fffba11cb9c6c9f1c90c91aca679ca6ad85a24315608b0df2b18e35194e703
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content or download further payloads. No scripts were extracted from this sample, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://plnjl.com/userfiles/files/4427319576.pdf In PDF document text
    • https://sainaudit.mn/File/69958598549.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/17ecf0a4077883f991ad54f3e3548d21/54560372557.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/7373aa28103516063d9a6c9bc99f5435/72560869702.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/1519052fd5b5ee558ced52e1c2092c0f/95192679425.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/5mncg410t65j8rqr6en7h47c85/55307562126.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7194278aca---gusomofekazexezezupipozos.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1cf3606df---kerufuwarivixujis.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/zixifa.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/vejozegi.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/82803672090.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/riwalopalutotuzijoxake.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/51893088715.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b7416b6d5---sijuwan.pdfIn PDF document text
    • http://napiarsaigh.com/images/22669551554.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608eec22b6f96---xifopesimij.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/agoi8esd9afq92pd21lfkhlm8j/88755801920.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/20353169223.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/55165912392.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a70a15bf7db---lenufotururuma.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d654febb6e5---zubowabefesefe.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/jugavaxizofizanufimavan.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161074b27e7fa1---57102950655.pdfIn PDF document text
    • http://vlajamo.cz/images/file/1039597594.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b88402d3e95---15648762034.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=money+is+answer+for+everything+biblePDF 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_off00010262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10262 10892 bytes
SHA-256: f03331b31c7dd6f18261355163901111f0f6e6f677dc5cc065df298db075aa06
font_01_sfnt_off00011ba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133BB 18484 bytes
SHA-256: 193a02b264c9ba803821f03226497a890ea9b60ca3fc4b35bebca884e34677a3

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