Malicious PDF — malware analysis report

Static analysis result for SHA-256 24ae31be54202e53…

MALICIOUS

PDF

67.4 KB Created: 2021-09-17 19:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1d897a061bf07e070665c6a5488d6db2 SHA-1: d726c24c46cc2058860901488ffa8c6abd6ca60e SHA-256: 24ae31be54202e53628dbc9504295c0000d5ca416db55859d393129d1c3e0965
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as a phishing lure due to its small size and image-only content, typical of a screenshot designed to trick users into clicking embedded links. Multiple heuristics indicate a link farm pointing to potentially compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or redirect to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/ketisa.pdf In PDF document text
    • http://nasledie-sluck.by/var/upload/file/wotalonopudemilufivedas.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/kebujotutevevi.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/zakelafoxazipe.pdfIn PDF document text
    • http://tieuhocsongphuong.hoaiduc.edu.vn/ckfinder/userfiles/files/44781100130.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/5214061473.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613721150ff69---97377455403.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/45132362064.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16141126e80a79---54045301612.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/96681740819.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/1032349913.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/69860047606.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/11567363846.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/wulugofiwusamonaw.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210913213559.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/suzixikifefelubefaxiv.pdfIn PDF document text
    • http://e-district.org/userfiles/file/95582370827.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/tuxigubunir.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138df68c392c---18451196367.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/ximekuwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+reinstall+android+on+phonePDF 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_off0000ae15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE15 10568 bytes
SHA-256: 25fc676ec92074fcc8cf1cc4555240dad840a6e9577f1b1fc3fdc1b9f3d2b2f7
font_01_sfnt_off0000c617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC617 13896 bytes
SHA-256: 39afb1f136d7e4a66bc5cbdcd5bbe0852f24cf02e527067e990588b708df1fdf
font_02_sfnt_off0000e87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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