Malicious PDF — malware analysis report

Static analysis result for SHA-256 440606e4fcdf55bc…

MALICIOUS

PDF

68.0 KB Created: 2021-10-01 23:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 60b6c3fbb9ccd3ae7c007abe64aabc91 SHA-1: e8b16cdcef05a9f611d52958e4b41ef640b1e437 SHA-256: 440606e4fcdf55bcc581598d44ed08e3295a3bd20f2ce7fffa9352364850f264
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites hosting other PDF files or are located on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The file's structure as a link farm suggests it's part of a broader campaign to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zagazzo.com/userfiles/file/3702519239.pdf In PDF document text
    • http://saint-party.com/media/file/voxof.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/genabaxena.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369e8072f3e---mamuba.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615193b52b1dc---nolaxomekutiwozawapep.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/42952769862.pdfIn PDF document text
    • http://charontrade.hu/data/file/95860717769.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/lasebokovikoxetedajonakam.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/jijetug.pdfIn PDF document text
    • https://el-tall.pl/pics/file/xamepaludekowigogat.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/fugojizumelo.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/xewugobekumidizagajop.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/wezepedimemovizas.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/60617664774.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/kodegetaledi.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16148becf65071---fiwozebotekek.pdfIn PDF document text
    • http://staropolski.net/Upload/file/88699397713.pdfIn PDF document text
    • http://bavlas.lt/ckfinder/userfiles/files/42455325336.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/zewabirejosibo.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/xutinegofavazam.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/23439338640.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135dd6c113e7---7045414796.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/dajunobavus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=bing+translate+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_off0000ad88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC59A 14856 bytes
SHA-256: 447518477b3a309d1794b47c776ccbce8c23a5b24a1feb5f1ac6d1e430163132
font_02_sfnt_off0000eb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2A 10476 bytes
SHA-256: 101ba106842d486db366b4c59a8e0e0c1e29fd16333afae27c9aab3a534f0d73

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