Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab22132972f5711d…

MALICIOUS

PDF

75.5 KB Created: 2021-09-03 05:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a7950ddb051953afb578d161894955f9 SHA-1: 20c242ab5cda4beac408d0013dab4bec99af768c SHA-256: ab22132972f5711d3b416fe3407df58b66e1c97e7ad40bab80bf55bd087e485b
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites. This suggests the document is designed to lure users into clicking these links, potentially leading to further malicious downloads or phishing attempts. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://nomylo.ru/uplcv?utm_term=delta+gr275+bench+grinder+manual PDF link annotation
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077385379cf3---tutaluxibilokegetewidut.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9fa0a8cbf---ninezagebesuv.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/67850839898.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/19516025373.pdfIn PDF document text
    • http://simonide.org/userfiles/file/gabenowuv.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210612191334.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/tanotezuberafekolosisitev.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/kiwusosole.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/c695f90ec2502c7b0dad69c9074a971a/bedizar.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/jemaxuvuzigid.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838489478be---lopegal.pdfIn PDF document text
    • http://agriturismofattorialucciano.it/ckfinder/userfiles/files/sedaliwisozi.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/61348160491.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/98001119417.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/47713227624.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/vivawemoxekulipobamufonux.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd7908ca947---fobewegabiwobini.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/67638632419.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/5d9a7da93d43eef86629ac84ff6aba05/30075196695.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/5f0cef74eee156057377093f674fc626/wimuleguvabeva.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ff0a9d326---6254830309.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611c84362cd50---tavopazuwonaxiguzajezi.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/jevinegozafepixa.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/vikarojapojisavetizunexup.pdfIn PDF document text
    • https://senhewood.com/d/files/84749353994.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_off0000c107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC107 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD919 17064 bytes
SHA-256: ba8da5b9696b459029d81a4a0db573ba1d2e255b65a6c80a2e3306dabab65c48
font_02_sfnt_off0001052e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052E 11076 bytes
SHA-256: 626ef04418aaf6d8a188cc8a220f8ff81c3722d768736d63b80e081a79187e2f