Malicious PDF — malware analysis report

Static analysis result for SHA-256 f96e2affc455b5f5…

MALICIOUS

PDF

84.5 KB Created: 2021-09-14 09:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e159b79d7662171f838d3d66b2df2755 SHA-1: 29129e630c9107bc0ff9321fc9dcc2cac5b83885 SHA-256: f96e2affc455b5f5d4ff55262c6ba2cf728ab271f72a4d8372bf000709c86ca2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://astdubai.co/userfiles/files/kanof.pdf In PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/82611284344.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/81765214024.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/wegazobudonufeso.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/33022700503.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/sikoxitadisunawefew.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/baxitemizakowakimowude.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/79354041905.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/74770461697.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/kurubovek.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614030558b47e---senakugokemegifol.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/39807318280.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb3bb03e04---31112337227.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/kerinonuxaguseremada.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/55861959983.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/nofesuxalilakaxux.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613171fb3ffe4---muzomawaxepelase.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/80173991111.pdfIn PDF document text
    • http://ping-property.com/user_img/files/novodumivanebosapifaz.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/jutugixenivok.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109071819202991.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/86904881079.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/popetebu.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/423806_jejiravulafir.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/161307adcbb1da---rokifigepanugi.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/nofutisis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=can+you+facetime+on+android+devicesPDF 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_off0000e4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B3 17620 bytes
SHA-256: 4cc5badd1239cea412dbe3087bf2e26990279e068d0ecd1852cc916b90944f01
font_01_sfnt_off000112b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B8 10904 bytes
SHA-256: 5dc9f21a74a53d52382309d5d831833cb6bfe46a375f53a94ea3a26c9a397c54
font_02_sfnt_off00012c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1