Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b702cea4b783c8…

MALICIOUS

PDF

72.9 KB Created: 2021-10-03 02:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 061346529cd157a0ef8b679f2ee05d04 SHA-1: edc575d5c5861b9b1d65649178c824d9321f56fb SHA-256: f1b702cea4b783c83e04171ec1f21c44c30d65d57ce6d9f5f5871981c19080f1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://alfadent-volg.ru/images_uploads/files/14443248515.pdf In PDF document text
    • https://3drm.bg/uploads/pictures/files/nadaxopibamonuvesejed.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149eabbaf3ee---49329817543.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/64823250238.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16153990916572---xibalomikan.pdfIn PDF document text
    • http://micruts.org/userfiles/file/nelovikugofaki.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141dd8c0f8c7---laminaf.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/26414705986.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/2a3d532c3fc9ab277402a3d4700d6ae0/fisafesofepuzaguselapu.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614e103a1b5cd---direwedemejagamijisuju.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/73956178223.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1614f1a8a8e616---zalovujuxawigabitizu.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/37465697581.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/32000542133.pdfIn PDF document text
    • http://e-menu.hu/editor_up/dewijuzawawetuwadaj.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/48986364147.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/95140658642.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/34597090904.pdfIn PDF document text
    • https://kvzriu.org/images/file/22824408324.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/13359521454.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/82723227343.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/15841249409.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/17973431553.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/kilojupativewavusidifaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+hummingbird+project+watch+online+freePDF 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_off0000b5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BE 11320 bytes
SHA-256: c7bf223b5b4eefcfee085f14b8185130252bd9e49c275e41ef062cfefc0acf35
font_01_sfnt_off0000cfb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB2 17284 bytes
SHA-256: 0dece1b8f86ad0f098fa56d5393b7be2a8cf3b7c0dac1af434b8ba8ae0c5c128
font_02_sfnt_off0000fb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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