Malicious PDF — malware analysis report

Static analysis result for SHA-256 554f364befd4f41b…

MALICIOUS

PDF

69.6 KB Created: 2021-09-25 00:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3d6b592309198be8cb8cf4a9da2ccf47 SHA-1: 592124ec060f0142fc5dd0752c8c7f9414473658 SHA-256: 554f364befd4f41b470de718cee8c210a31befe2d630e1cd35665deb0727db80
156 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of external URIs and link farm heuristics indicates an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://a1-automotivegroup.com/upload/files/3560575523.pdf In PDF document text
    • https://jdconstinc.com/ckfinder/userfiles/files/61764087800.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613880484aa76---novezimaxipofesabosi.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/18726670500.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/23145921574.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/19513688731.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/98925f7e1774133b7bfd0e046407cea3/nekadawux.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/rivemo.pdfIn PDF document text
    • http://szhlfz.net/upload/dorisagitowafopezeme.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/lokokasab.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/9lfcd7prm2d0donnradehp5ihq/morejitu.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/mesunofatokekeriwu.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/vuvonakejet.pdfIn PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/galigamatugolediniw.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/rilumisololito.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/rdhvit4jq49g31qsbnltdara44/98345865952.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/94291262198.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/dowutotipanab.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/13018427233.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/rosiwozuwijinesixudazif.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/rafetojov.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9d664f300---70178938123.pdfIn PDF document text
    • http://esistore.be/userfiles/file/42074942381.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/nozonebogom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=warface+global+operations+androidPDF link annotation
    • https://unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/fizelad.pdfIn PDF document text
    • 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_off0000b1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F4 15128 bytes
SHA-256: ceb115efcf77dde4f47359b6dcd9c12ff9fe10182eace2820c0b395928ef4c0f
font_01_sfnt_off0000d7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C0 10928 bytes
SHA-256: 7df95a271544270d58fa5a58e4a9e97547898c5e34299c0cb7645fff451beadc
font_02_sfnt_off0000f0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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