Malicious PDF — malware analysis report

Static analysis result for SHA-256 0804bec502268751…

MALICIOUS

PDF

82.6 KB Created: 2021-09-05 22:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 402263ce78da8ee0a7c4a9f31562548e SHA-1: 4a18746ee54bd6a3c415c4dcf0c512a200f1c0ce SHA-256: 0804bec5022687518fda47b1bf772bfcf73c342f2657e30d2de9187b7654c444
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm on disposable hosting. While no scripts were extracted, the primary function appears to be directing users to potentially malicious or manipulated content hosted on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/a3bf9c7dc9d3833dec77b3112a235a43/mizitugojopuw.pdf In PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/sumexedifisepepezuvi.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef5cf2a0f9---65789653570.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea59c43be5---luzunatoxa.pdfIn PDF document text
    • http://lbhodgereunion.com/clients/3/38/38e1f81cb1ac74d12d86c8ba87866b9f/File/jesafolavawu.pdfIn PDF document text
    • https://akvaguru.hu/user/file/29256777079.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/hm6s3k81h5hg4kf2pl7udu9517/27890904950.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/21025973369.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f028b9bac.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/567d6920e0b5cf24d96b9956588d4c07/38918545511.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/fipewejewasan.pdfIn PDF document text
    • https://agatanorek.com/files/file/42592459197.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/95721462297.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210905/1902523344.pdfIn PDF document text
    • http://erpos.sk/data/files/pagolusidekigixiveligamef.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/mepazuxametenesa.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/nuxufikinojo.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/2119483367.pdfIn PDF document text
    • http://chipgene.com/image/files/20210701_113302.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f74639929---45285618470.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/v4f4cvmg3nq91at2mfcsch0t2i/lowekabegiragediv.pdfIn PDF document text
    • http://abwrva.com/uploads/files/55015672736.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/95630548901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=blood+collection+tubes+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_off0000dd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD44 18076 bytes
SHA-256: e2d59ccf23849d4043f88d3749b9f6158c30dae476cf4831e27515e581a4e1bd
font_01_sfnt_off00010c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12451 10644 bytes
SHA-256: ca92b0221a57e4af16b93fabdc7f651c71422d807305f93e175f819e46b25530

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