Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca8de66513d67d19…

MALICIOUS

PDF

81.3 KB Created: 2021-09-05 21:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6695c2006fe794eb9ff98a47fac6351b SHA-1: 0d125cfa47bd07276e966d6227a3ac645d155448 SHA-256: ca8de66513d67d19f4f8ef72710975989ff78f64d15755a01f5f61f46a0befc8
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to numerous compromised websites, suggesting an attempt to redirect users to malicious content. The ML classifier strongly indicates malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inwebjor.ru/uplcv?utm_term=julius+caesar+play+pdf+free+download PDF link annotation
    • http://championshipsportsrings.com/clients/23492/File/bubatixiwetaze.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/365926546.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/44042166424.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/8fde5c2327adb10dde95d4fa47f89148/74698694176.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/51975465732.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098643b7ec1c---kojalidigel.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/03v9rst71sok1734d974c9kfsd/30711947103.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/7353713111.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/76587757594.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c625d3dcf53---nuvijunefefesuzow.pdfIn PDF document text
    • http://fitviewer.biz/files/file/nuwij.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606f81f60903b---27417176084.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/1b7311f45c3d9d607b03100a2f1a9c50/sofebipasuxepoxukoxutar.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/93012994945.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/witukebib.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89ca7c05ad---40927785420.pdfIn PDF document text
    • http://varanini.pl/userfiles/file/1141312602.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be8ea3d4ac7---80239558468.pdfIn PDF document text
    • http://nakatka.com/files/file/58826251179.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c29f35120cc3d30ab45004cdfad4eae6/82546710892.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/68l4fc1fbujn9m8eqb0gk151u3/voturo.pdfIn PDF document text
    • http://guowangcable.com/d/files/dabulesef.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9e21a1511---xiwizedujabutadegejal.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_off0000da78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA78 16864 bytes
SHA-256: 26340128496c82b160c728b3b2cbd0527f7b4a9e643e2855b12eac07e8b57d5f
font_01_sfnt_off00010649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10649 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E60 10808 bytes
SHA-256: e201bc219ce7f33f1b0535eb256b62d8c2047e6f7ae71eae9bf04ee9c7e2d7ef

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