Malicious PDF — malware analysis report

Static analysis result for SHA-256 1889ad5fc3c62044…

MALICIOUS

PDF

93.0 KB Created: 2021-09-07 20:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7d5c06144097129f78752fd201e5680a SHA-1: 00df4aadcef535e0d7437e49da4284392e64f836 SHA-256: 1889ad5fc3c6204425eba03868405924d63ac7ee475eead3662e27438ecdc8c5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of embedded JavaScript and a link farm pointing to compromised CMS uploads suggests the document is designed to exploit vulnerabilities or redirect users to malicious sites. The primary goal appears to be user redirection through a network of links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://theprintfactoryvietnam.com/uploads/files/lonigaf.pdf In PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613505afe03dd---77488631811.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/17018849201.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/furuze.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/pobuxurudafimutope.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/f725ce4062ad77a93577a73cf9ccddcf/42041095657.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/joxipukagatusup.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/koninejaveropajogi.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/77711248629.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/88svbgmhovko96ghv77bdb0454/33295055225.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/e8c3d4d74506a541857409caca45d806/duroxuzakisasawoto.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a293e3dcf0a---jabukegozigikoz.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/fudilaju.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/1498e5a1606c7c9f85226847d261ed15/89014692253.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/41208057889.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160924e5c2b5ab---gisebatebozikem.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d69a4699e11---manan.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__610643246F576.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/34349009640.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/8b04f0217c53388cf914028ead6c746c/wutamumolonivapig.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ab8a506e6---8043574600.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+growing+pains+of+adrian+mole+pdf+freePDF 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_off00010358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10358 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6F 10896 bytes
SHA-256: 96530aac4b74c9cf201147aba7eba12c7c32859b5fa8ad717d9c297c2376deee
font_02_sfnt_off00013444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13444 19028 bytes
SHA-256: e77a5d331acb54d1f966b2f3c7a768ae1ce403feab5f6d421cfe810c27e56da5

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