Malicious PDF — malware analysis report

Static analysis result for SHA-256 0405f17d4d4ed15a…

MALICIOUS

PDF

78.1 KB Created: 2021-08-30 07:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1c68f40f88ee4a70a15f2a0fb50ee141 SHA-1: 420e1bd7a6ba500398ae5187444b56cfe81a203c SHA-256: 0405f17d4d4ed15aaf30c5d195ca6761231a1c49100e447a6cf36f0dbc17bce8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the link farm and the presence of external URLs suggest potential for JavaScript execution or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://archism.ru/uplcv?utm_term=order+of+metric+units+smallest+to+largest PDF link annotation
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/hhon2co5tc0ute78qn7do0lj79/50975120242.pdfIn PDF document text
    • http://xn--h1aaebbkfib4a.xn--p1ai/sadm_files/neropixipilotuwidezidiwe.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf9e34815a---kotopefowa.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607539d0c4046---82527922168.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/15646399116.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161108d243d77b---55440838445.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210728093043758524v7k4u2.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/8gc427nqd5550dkl0islnbmdh8/puwizuxexedaxugel.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704a5c375c7---8519627153.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/69240036467.pdfIn PDF document text
    • http://cartopack.be/Images/file/98718238587.pdfIn PDF document text
    • https://gerastar.com/userfiles/file/34539228731.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/xidadazaxiseji.pdfIn PDF document text
    • https://craft-personal.de/userfiles/file/22354350337.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/71266394849.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/79456022318.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609446e70a1e5---49086965026.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/5817996344.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7bb3cad6780d98c93630a5173f20ff42/32871582921.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094772d3b141---gorilisuxobudogen.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47747109010.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/rovadatik.pdfIn PDF document text
    • 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_off0000ca27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA27 18140 bytes
SHA-256: 5e9fea7d96727e63f22823ef8d53a6baa9401bd30c918d2adcc95da38fe0545d
font_01_sfnt_off0000f963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF963 10944 bytes
SHA-256: 2e1514618ebd6fbda9958884a7b9cef10a0d015f5f8dcb0bcd4f93f3b348c07a
font_02_sfnt_off00011292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11292 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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