Malicious PDF — malware analysis report

Static analysis result for SHA-256 3966acd7c1ca6d32…

MALICIOUS

PDF

78.5 KB Created: 2021-09-17 02:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2773c69758d0094cb678eff371be5379 SHA-1: f73d9ed104a506973f87256491b12be8dc78093d SHA-256: 3966acd7c1ca6d327812709f165497d6e0cec742f705c7c2e0e7dc53a62c3bc7
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of multiple PDF link farm heuristics indicates a deliberate attempt to obscure the final destination and potentially distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ilonew.tasksplan.com/ckfinder/userfiles/files/15316042683.pdf In PDF document text
    • http://thaifilmind.com/UserFiles/file/lesizasa.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/lumivigexetile.pdfIn PDF document text
    • http://tai-group.com/upload/files/61266853527.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/86899875912.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/4b62343614cdf573da7ac7af38e0d5d1/jamimukagojimagarep.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/fodimosut.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/files/80093830028.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/20916361123.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/rimufu.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/dasidiril.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/poxer.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131557e706ac---46534280557.pdfIn PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/95898133844.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/zojogaje.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/vuwifore.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/wobopawosediwatubolupir.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/79642419058.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141598294410---66629422972.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/fulinez.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613939b3edd26---fitejukutaladukeziti.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/0a98d14af6bae65b55980897524efd39/tupotefibopukowezasimala.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/nukuvoribajogawido.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133aaef8f320---49701272623.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=streaming+film+handmaidenPDF 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_off0000ceb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB4 17524 bytes
SHA-256: d5061aacafe4356308427b575260852a1132439d6accdbe4e71054feb821f020
font_01_sfnt_off0000fc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7F 10588 bytes
SHA-256: 6b94023434ed193cb9eda0ccbed368704cc38daba1984562793d0ac11e402610
font_02_sfnt_off00011440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11440 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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