Malicious PDF — malware analysis report

Static analysis result for SHA-256 6854633f7d36c697…

MALICIOUS

PDF

82.4 KB Created: 2021-09-02 06:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e00e6cc3130dca70dd128514ab7015bc SHA-1: b4283ac4c185ec917f0c82f088a7b62db3eb57ca SHA-256: 6854633f7d36c697526002e51c898d52ef0bd61621581ae18c8f2c59f035c4a7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites and utilize UTM parameters, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicated maliciousness. No scripts were extracted, but the presence of numerous external links indicates an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 5

  • 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://huntic.ru/uplcv?utm_term=are+days+of+the+week+capitalized+in+english PDF link annotation
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702a902c5f4---36413062887.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jekikosofidu.pdfIn PDF document text
    • http://turnyras.lt/Files/file/sufare.pdfIn PDF document text
    • http://vit-physio.de/file/suzixuwotot.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9f59a342b---19212851462.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a65a13aec---xixoduzugajitivanuvumo.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/megazobotaxima.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c68fb0366a---zopiwabunarumivokav.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa1e65bd12d---96565697458.pdfIn PDF document text
    • http://zxsolar.com/d/files/22386704970.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/serepapisawalodekaje.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202105172157185266.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/14300908667.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/mumigegefo.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/69201709752.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/sonetogufat.pdfIn PDF document text
    • https://onecre.com/images/content/files/maxebotupun.pdfIn PDF document text
    • https://avvocatoboretti.it/file/61942105860.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/71561726231.pdfIn PDF document text
    • http://candientushinko.com/images/file/57115008754.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5d0a5ca5b---nowafudevazozemosejonupuw.pdfIn PDF document text
    • http://sitepride.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/divivelewesinurosafus.pdfIn PDF document text
    • http://uco-kampen.com/media/files/98773993861.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/85878414838.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_off0000d8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AF 18468 bytes
SHA-256: 833dcf37be07999ad5f61b78f303ee647b81e32961d53168ceea929250177c1b
font_01_sfnt_off0001089d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B4 11232 bytes
SHA-256: 15accc6fbe4068f658d68d1c1c745805dcc2915136f00b974b46396bc96e254e

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