Malicious PDF — malware analysis report

Static analysis result for SHA-256 da84f12143ef592e…

MALICIOUS

PDF

88.3 KB Created: 2021-06-27 07:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3ef7f9f8843ccc9e26b73eea98f31856 SHA-1: 411afe7ebdd715f24e9b81e0c214f210f53bb37d SHA-256: da84f12143ef592e667231628a5a22ab3feae273b4982e5776f340704082a2f5
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 installations. These links are likely intended to redirect users to malicious websites for phishing or to download further malware. The ML classifier strongly indicated maliciousness, supporting the assessment of a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://krisoc.ru/uplcv?utm_term=interpersonal+sensitivity+meaning PDF link annotation
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8a9067984---gopuwuvilonajij.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/tawosapusefirure.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/wapugodo.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/f99v2dnns3hovudc48ma0edsc6/tuvexolosuloxubiwerexat.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/83763762705.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709a3ba998d---73447418281.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609caa1a6f3fe---wonefokode.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/d554d79501658c241f67d8ef0af01ff8/84559757320.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/145a600a76b3bcd200f0787f69236b8c/82471040488.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/40704467728.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/8a3c7ebe5a8421125ebda662ba906133/vizuxazakepetomotof.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/23906012030.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96ae4e4ec5---pafafuvadegejifojakigene.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/7e1c06957e2d6fe4242e143e148fae8e/tisexijamizanisetagulubi.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/1429b125c5f7c00192ffd165ba83796a/74926067312.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/valegabaloditita.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/80614710972.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/ma40ej5d4l06rdake8b0uppk1d/delapuwosawobarut.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d326b4e9b---kugofurigumaxabinuguz.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/3c4420eec7e2be2b8ad0f2c41462f0a1/37939166760.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/gebakagojos.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/7f168c287589953a017e7791375c79d4/rapaguvuru.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_off0000f513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF513 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2A 10724 bytes
SHA-256: 06418281d0b186445b940c362e095ef7fcbe8ee6af0a022ef7a67c4cbe973904
font_02_sfnt_off000125d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D0 18460 bytes
SHA-256: f9b83713325fee07cc6cc71d923c5ea4e2477089e8202b287576c31822d99914