Malicious PDF — malware analysis report

Static analysis result for SHA-256 56d5aa4af4467e2a…

MALICIOUS

PDF

77.9 KB Created: 2021-09-11 11:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a0a47fe9658ea0ca88a0d6c2ae01ce19 SHA-1: b371d9f599c003bfa260311539bee308be638649 SHA-256: 56d5aa4af4467e2a1b1e9bb433cc7ce4c54a5a2e028cb70700448226ea2d6d55
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://rfaaa.com/UploadFile/file/20210902202119697.pdf In PDF document text
    • https://tidaksusah.com/contents/files/81923168089.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///52591646577.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/30081922965.pdfIn PDF document text
    • http://naso10.com/userData/board/file/gexezinebogizumotubi.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/70825921611.pdfIn PDF document text
    • http://aweibel.com/Photo/file/75914407784.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/74951175189.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/97562442573.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/mixewopikigujelog.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/25347109216.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/notuvigameb.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133bffcb9398---90465216285.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/48767332052.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/rorewerovasumuluviretu.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/rinik.pdfIn PDF document text
    • https://tomas-music.com/contents/files/55316680646.pdfIn PDF document text
    • http://soupworld.de/upload/file/radasataketalogarame.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/23034866709.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/64123589182.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/84123713473.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16138d10e97ed3---2377419313.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613162619a9e2---fitofativenenawuja.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///lajekodekuxosizekep.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/97454efa7f113b411de2c46355a61caa/ruduzivepabeket.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=android+e+book+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10D 14804 bytes
SHA-256: ac1652ad7c141ef0a20f130df86dcee8c9122c51c357f82d93b50aa85c8fb123
font_02_sfnt_off0000f628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF628 18024 bytes
SHA-256: 027535a2509da5ee5e40df4c033ae726db50fa08aa50a5fb20c7018d8f128a0d
font_03_sfnt_off000111ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FF 10380 bytes
SHA-256: 3ca8b53f4092a4b61c6471759387714a6bc7cfe1e4de5659ad0258182bbb671d

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