Malicious PDF — malware analysis report

Static analysis result for SHA-256 05cda780183a2a98…

MALICIOUS

PDF

79.8 KB Created: 2021-08-27 14:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9c7f1303ddfd3cfa244b74deb22c2ccb SHA-1: 08fa2491b4e4b90838f9d239e422edd188fbdf06 SHA-256: 05cda780183a2a98990a581adaa289f4937a0eee6618015f58b6252ee3766579
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://drafthe.ru/uplcv?utm_term=comparative+form+expensive PDF link annotation
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16126d916e9197---20485711104.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/luguw.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/84026234076.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b8302282e29---32346100564.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/zawekisexenusutaxarisudis.pdfIn PDF document text
    • http://walkercombsfamilyreunion.com/clients/d/df/dfd517ab040340b2551da60fba195f5f/File/figufoj.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/626236cc64b139c284573e2ffc334677/mudusepadoji.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/lumakemazijobazugidonil.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/b879ef2b665cc69421eb555bb9f308ee/mifeliruzaf.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/f48357088e8985ada6379666569f94da/konakavirewomefexikowos.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/30607459994.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ae188b413---foketefikafegoxematotag.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/kepun.pdfIn PDF document text
    • https://zop.bg/webroot/img/content/files/lererim.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/tosobutisisob.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/nugiruzigilavitam.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/c035e5871b31c0e309d5873601d3ca20/pudid.pdfIn PDF document text
    • http://prestizhstroycompany.ru/SITE/files/editor/file/99492489629.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/2ce8eda2d5588b6341934930261391e0/4054971469.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/jijegoxaxunagexa.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/950c443f470c8023fc6dcfdb48f48d4d/xakopiteririzagagif.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/72900491771.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/51859361913.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/dawadonedetilawilofenas.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/danabunewujanerijixo.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bf18f3276---95329710126.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_off0000cf40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF40 18920 bytes
SHA-256: e9fb59039c228facfd8191441f4d583afd8f1feebb32504bb62e0f736fc612d1
font_01_sfnt_off0000fffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFD 10672 bytes
SHA-256: bc520a87a67d43bd16a9665c5fd899201e74e9a1a363f33af06105c495c139cf
font_02_sfnt_off00011888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11888 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1