Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b770793a0885c2c…

MALICIOUS

PDF

166.2 KB Created: 2021-07-16 11:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0aac0f9cbafe75b49b4e5f62cf67b746 SHA-1: 134e7287125fffdd94629a506800280778bc47fb SHA-256: 9b770793a0885c2c4b572baf60b9e4e21747e27882b4502e0716820c49e056a3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by an ML classifier and contains numerous links to external websites, many hosted on compromised WordPress installations. The presence of these links suggests an attempt to redirect users to malicious content or facilitate SEO manipulation. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious link farm or downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

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://coretry.ru/uplcv?utm_term=geometry+test+answers+chapter+4 PDF link annotation
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/4af96cbaf43f4b3eb4ddf711cb5ec6da/46461952090.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3af24ac0c---tiguximi.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe8f5c49c2---vepisexoxilofifunadoxil.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4e22b9112---74629623283.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/fetisojamalasibedebegi.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/32447032069.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/98921081114.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/t3ksb9pmi4bjaaprq9d24rsdc6/zenodib.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/jozoxavikugilomun.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/95774153304.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/4df7bed70feef29d28f689010e277e43/52213203316.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/sejawidusaguviw.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/nusodokozonoladiru.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160983f6a59c62---xedadufejabagexugiv.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090dbd7af70c---xivojosenenugilewozi.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/kafekebelubofejapur.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/b32edae03b6f215ec663f5fa6f3f6f5e/podipubuwis.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/91931220967.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/ninegekipu.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/23340259902.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608b410f9b21d---soruzidiponaruvugeroxanir.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/071419273153.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00020410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20410 16232 bytes
SHA-256: e23c9d69fb554575fe46ea7f457af1a8a8d738ed7e49ce78d4cf105a59119e22
font_01_sfnt_off000219de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x219DE 1704 bytes
SHA-256: e4f035f98972946864e5ec6b782be1ab20aab397120685f0370b3fba311b69c8
font_02_sfnt_off000221e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x221E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000239fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x239FE 10816 bytes
SHA-256: 199d43f86a0117f87b79e9a45a9b224ad1c50c954872ed4889dbf5d9e08787a1
font_04_sfnt_off000252f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x252F1 20360 bytes
SHA-256: 281d49301b790316b39359734be868e665cd3767310ae4dbc9fbbca2645544a6