Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cba9b989d384532…

MALICIOUS

PDF

132.3 KB Created: 2021-07-26 09:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0c0b55070e09b0d223dd4cbecb8d2492 SHA-1: 1df89c70cf67bd1ab17ef69b1f517d5a68d424af SHA-256: 1cba9b989d384532caf288d58576a69f234a1524702ee85bbcd8c323d92202b0
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, but the presence of multiple suspicious URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/fd9b8dabd2fcec145845b05b168191f2/dotifuli.pdf In PDF document text
    • http://imailbox.nl/images/uploadedimages/file/62126570001.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/dd7a1caf3e51d08c4c21dcf0fbfdf656/64521970015.pdfIn PDF document text
    • http://garderoba.sk/images/_file/nubewuzabuzulomuga.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e02635ef529---wepasot.pdfIn PDF document text
    • http://popmetre.com/news/files/24365396251.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6b09e5708---22560255201.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c861fe24402---37203670190.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/5fe9f67039a7dd202ad226bc5a2f5879/todawewawixutovediv.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/vagofigedisinojijikewuwi.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/l8n0505r125pj441nhhggdfq44/bumefiviguzavitewo.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/31fue70llcbntr85n7ha8pedjp/87442626567.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/8605152279.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/p5div6uj6f4o9meevm8v84bmvd/tofokigunosibuxiteg.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9cdd70461---pokipite.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/taponolobakajoti.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/cb3bnd7c9icbm2fk229c0vq2tr/67867489190.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/75679528332.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16098347c8f96a---43671275141.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/35299380961.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/01f536a4b24dbc79277396fcedd1110e/93148054382.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/f3073400b0c7ecc61cecd9d8884fde4c/limalaxokokakur.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/vepufurorukowo.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/mkn0cm2i30gpa0u3c8idjvahcn/52641430202.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=descargar+ganong+fisiologia+medica+25+edicion+pdfPDF link annotation
    • 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_off0001a143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A143 11120 bytes
SHA-256: b8a9f27b9c57c5b6287349750fa83895ef8dfafc0512ec3d358aa7d6ba095977
font_01_sfnt_off0001bb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB0E 18596 bytes
SHA-256: d0a087affa53f5c35dde9ff8e1225f73580a62b8fe203967a4f4d47139a0c9b2
font_02_sfnt_off0001ea62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EA62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1