Malicious PDF — malware analysis report

Static analysis result for SHA-256 65e9c48817bad66a…

MALICIOUS

PDF

71.8 KB Created: 2021-09-02 18:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 55387e03f8f2eb1cb7c3aefde9916748 SHA-1: 79dcb67467d1d97fdd8ca85a6efef970c67f7240 SHA-256: 65e9c48817bad66a1cad14023c25286d7890252439d13ed2a36e99937dee707b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to obscure the true destination. The presence of these links, combined with the PDF structure, suggests the document is intended to redirect users to malicious sites, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606d049a64a54---nuzew.pdf In PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/mvddgn8jpp31gn397f2e6q3id7/55785688608.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/96082504501.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/67734343911.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/78803369907.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/zobimu.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/jemodupifoxubudis.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/nonafurexinis.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/05/file/202105151024174392.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/14732286323.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/54141136535.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/v0d7e50dp4k9n8gevhfi8f7771/muwimigisilivufuku.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3999cd64a---givisuxujilakogovixafi.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/45b0903f9c605c157bd73f66b8eaeea8/xenos.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/35017742901.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/ecdqkb0i261d2d5o405t7ftq0f/40414487505.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/6e53d7cc60a5d92125705a2149d5c670/limudaketumovunijazoloka.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b06a3928cd7---72275453089.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/kupomalopupepo.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078042fc6c0b---desoxaxogenogamixuvopidod.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074956198f5f---xanemede.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/jojatujalodez.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/wozasis.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3dd271fa2---zadinutisumemiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=watercraft+bill+of+sale+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_off0000b946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB946 10644 bytes
SHA-256: 3f38e42f9df677a95da90c4d5dbc34ffd2ec80a02ca5b7a5303b7f2abe95ba1f
font_01_sfnt_off0000d18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18A 15656 bytes
SHA-256: 70b3c3e80ac52ea2f3af9cb7e503057b08702b9323f8a532e53f6210133fae1e
font_02_sfnt_off0000f931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF931 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1