Malicious PDF — malware analysis report

Static analysis result for SHA-256 f56d9ef07d48c78b…

MALICIOUS

PDF

81.8 KB Created: 2021-09-06 05:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c0ba4a49f50ec818be926c6b39e6edc3 SHA-1: 6bcb48c57fdf42b9d9b4c55bc7d20a59740725f7 SHA-256: f56d9ef07d48c78b8fe368a8d57e29e71cd1c906fbc8a4f6d20f91a61b4d07b5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://papierplus.pl/userfiles/file/71641577665.pdf In PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080f1fbd039a---vanomawepike.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160717ec436afb---69620164832.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/nobosutarovukepebizebibi.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/bewun.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/99109880909.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/10975298840.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e37ce7bd0---jinafisutoxodut.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/10624678508.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a71efe18ca---bobogunibukewevotelez.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160707b9263842---witizo.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072a9aa6cc01---68944184733.pdfIn PDF document text
    • https://melz-feu.ru/upload/18796318513.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/69741112497.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6a85bc2b4---zamuwoxibefevixevuxukebem.pdfIn PDF document text
    • http://nktrading.qa/file/files/dogopimixuseguzipatedopir.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/92481277922.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/e1df8eb84484b5759aa7166a13ecf208/pifabomelisokubexunumu.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/zekesibojero.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/tikigunav.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/742nibfubap8uqdff7vntl3hd6/jaruke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=philips+avent+baby+monitor+instruction+manualPDF 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_off0000d88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88A 17912 bytes
SHA-256: ab5577e62f5a10d1aa3eece1f2ad8430617db73cdaa6238d0db561cf3ea2ce7d
font_01_sfnt_off00010683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10683 11060 bytes
SHA-256: a935418243775525180fe7d13dc10cf2f645bc760eaef79f6bc4b33ceba334f7
font_02_sfnt_off00011fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1