Malicious PDF — malware analysis report

Static analysis result for SHA-256 b26b6483836cb95c…

MALICIOUS

PDF

80.1 KB Created: 2021-06-29 08:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3524d8b2f699dccff1c37c26eef8e415 SHA-1: 2e4b226f0fe8a0add2dce44af8190c1cdfe3e6f0 SHA-256: b26b6483836cb95c57564a51c593da6d3f4c8bfe17314f9827311561e62033fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to exploit user trust by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://h-st.nl/bestanden/files/96748614486.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160760aff7810b---jawetenonabufokot.pdf
    • https://pharma-tools.eu/galeria/file/92641760204.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/f1ebe9fe2c0496a11d079e0671207f0c/37474583933.pdf
    • http://anthonyvienna.com/sites/default/files/file/mixorawizelodilegowejo.pdf
    • http://tv-sat.cz/userfiles/file/79349076641.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/6b1ad9ceff456b193f2bd0527be4ca1c/vejurawimiduzitigekaze.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f50eea4621---2717618122.pdf
    • http://gramercy-grand.ru/files/file/49438023909.pdf
    • https://bdsvieclam.com/upload/files/tebijawilubalizesa.pdf
    • http://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/nofukumafevulit.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/9qbm1mdoqdtv5g94np12v2mt0o/pafagazux.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/0f765c0078617d6d8b77d40b79b3d6fe/buzawisi.pdf
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/7eaae68e7035d723964d1872b1c50b5f/zukoxabosum.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/a5hi832egg8rnct7ravnibsrmo/basok.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe82eb3fe---tuvakarawoso.pdf
    • http://maxtarget.by/ckfinder/userfiles/files/kuketifatoji.pdf
    • http://aps-mes.com/files/file/sowixodizusaxufojedatew.pdf
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/morolanatatabomivureweze.pdf
    • http://hotararicedo.ro/files/files/domuverizamojirozamuxu.pdf
    • http://timandlor.com/userfiles/file/48632076242.pdf
    • http://ahxxzx.com/userfiles/202104/file/bokilojisefemima.pdf
    • http://musorcentrum.hu/files/article/file/ropejakokovef.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a22e8d99e1---buxirewiwozumil.pdf
    • https://fullhousetourism.com/UploadFiles/file/20210610105134139.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/ds1i0b9uroc0jeqkro2evcdbo9/45247113463.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=bosch+home+security+manual
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8ca.bin
357de94eaea45fa669e020ffaec42d7ee81bc92898f42974007913ea33768260
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CA 16132 bytes
font_01_sfnt_off00010282.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10282 16792 bytes
font_02_sfnt_off00011a99.bin
cc549f535b88dcbd0637e3a52d2ee821a9d45f24a3b22854c1be6d1467fcce0c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A99 10760 bytes