Malicious PDF — malware analysis report

Static analysis result for SHA-256 475b2b2a05822ff5…

MALICIOUS

PDF

90.7 KB Created: 2021-08-23 13:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a61c86d6aca00912f19c1499576852ef SHA-1: 850c5d46e56b0d089f495b30b75ac17347a4c9ea SHA-256: 475b2b2a05822ff57802aabe7b3cb0fb14e3d190fb9b26fed666bfc4616f5ee3
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating a potential for malicious code execution. It also features a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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://mnwebdesign.dk/userfiles/file/jurame.pdf In PDF document text
    • http://al-bandak.com/userfiles/file/fozezixuzedu.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd09cb3193---10393514247.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/32667837556.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e54186b52---fojuvolumonefizefa.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/xuxobi.pdfIn PDF document text
    • http://newmanclassof1965.com/clients/4/4a/4a7b3a1a0fb21659e68ac19badabb541/File/gatokiv.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/50272863760.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/minuluvaresurodis.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/c7b2d45985bae9b34d05081d47228b21/31324646929.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/rugewu.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/9klv125k6eah2pnlucgfas7rrn/28868521543.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a809f5133d---37076364311.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/248379a1131c9aa6da339510583bf3c4/zekegapofugefenilu.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/4517jdkvjni7tr3u0fp30noq18/wazoku.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e82e303416---36823300647.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/galifadoburupu.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1db056e5---wegosetuxojusuxax.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c627457b7d1---98638469119.pdfIn PDF document text
    • http://codefon.hu/js/ckfinder/userfiles/files/baxudadutarexulogegaw.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/zolitowifetetovexo.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/60345350120.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d061ec0f1---tatam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=poverty+chapter+economics+class+11+notes+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_off0000fb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB27 17500 bytes
SHA-256: 1eaa8d316d6614d2ca0b9d64fb1df453f765b8740e42681519fedf2a19c8b479
font_01_sfnt_off00012957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12957 11116 bytes
SHA-256: dd7c6924e81ebc767402e98c19b41db5ffbb9f108e32559338c3b9f8ae6b5aa2
font_02_sfnt_off00014330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14330 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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