Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b24ab3231983780…

MALICIOUS

PDF

74.9 KB Created: 2021-09-06 02:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2991fca034bd56db9dc6873f5ea5619b SHA-1: f0e336363eb63ddfae0e06955c4b85c9c0c3122a SHA-256: 3b24ab323198378020ccc67def3015a6aab25dad8e6baaceb780b40db4abe8a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The embedded URLs suggest an attempt to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/cb10efd71310b2ac4581c61e6616f0b3/zolitumuxepineluxilafavef.pdf In PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/eff1603e2db86d51f56b5f718854e03e/dasabipubelaxijulanudezu.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/pigerewexesedasuwas.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be7e92c6880---25906835973.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8afd8911ed---40939703903.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/wajojugadogulur.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080619928016---49351555533.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/63505809245.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/79576809048.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/92606818492.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f332343df9---fabedatiruwomatul.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/wakumuvosifajuda.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9401de3ab---nosobenowoludutudozig.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/vepasobupivixe.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613334cbddbd0---5769775162.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16107641449480---rivuwi.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/68072376866.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/k81168dfbtj4cbcr3c02camg22/96467977796.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/1677208296.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/c522357b5062f71e8600f5f384d5e07d/46390243607.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/bogejewomekipekigome.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/57135490429.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=esic+contribution+rate+2019+notification+pdfPDF 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_off0000bf84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD796 17152 bytes
SHA-256: 499348b0ae4a1f9fe04e95d106617010fcf62d9085a2116ce355d1ad4b0f6a8a
font_02_sfnt_off000103d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D8 11252 bytes
SHA-256: 68d488126a8674c4c4b7344f7cba8f8ea74b71cb75c16a919e161fc0ea76f864

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