Malicious PDF — malware analysis report

Static analysis result for SHA-256 9813a7fa0ed0e334…

MALICIOUS

PDF

81.1 KB Created: 2021-09-07 08:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c7696f0b62661902f433a78ebdd8968c SHA-1: 63765cace7ca1987cbd0cfd67979c19aa7380fc9 SHA-256: 9813a7fa0ed0e3344d982948f5348b63f6754884505b767c9226edfaef1a8b10
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to redirect users to malicious sites. Heuristics indicate the PDF acts as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute phishing content or malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • 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 https://queure.ru/uplcv?utm_term=sight+word+game+worksheets PDF link annotation
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/1459c953a3632b02a9bfc51503bc0fa8/nivafisotazi.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/85907092331.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612a862d5051f---5246997929.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/sutojepe.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/65571691952.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d45d1193d9---31015776202.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/a9d318e941f30105d046d26263ede64c/32919023156.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/nuwuperefet.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/4d6948cd73e1161bd38421b5a9eab32c/89237847019.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/d1a01f96593f063e1ae8b19332bcd3cd/73236314837.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/74905578772.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/73830319d7f67d16ca8a5df2c9f95a72/pigujapivovafuxisatasesi.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/b143e1d0c1f893a3fc1bddfec38ed124/tirolomowiposupoto.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/bapanudinoleguze.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/95721867860.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c00af5831f---nuwax.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/konamix.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a43c0ed0c8---jixagokubi.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/sopafubodisis.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b0388028---55960408421.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/50f0a6ed8644c02c9c731c8a62353d14/982258910.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/46129076625.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/95497928490.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c577a150b---zumiga.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_off0000d90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90B 10800 bytes
SHA-256: 3ce22bc143a1bb688d88f413c08182b9c8b6c9d9dbd70ff724c0c49703981d10
font_01_sfnt_off0000f1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D0 17640 bytes
SHA-256: 53a33f6aa6b0e6fae63528591f1f7ef56c708bb18ec6e5e9f5e753c8499f57e8
font_02_sfnt_off00011f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1