Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff0c6f39ea5e989d…

MALICIOUS

PDF

89.6 KB Created: 2021-08-11 13:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8a5c59a9e7c52524b40a6d0323231c2d SHA-1: bab274c632b44aa6044ab3c5d445df5b91f36d52 SHA-256: ff0c6f39ea5e989d5ecefe04c0ba146302498b7ab097f20124645b3bac2ac033
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and numerous external links are characteristic of attempts to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomylo.ru/uplcv?utm_term=what+are+the+beliefs+of+masons PDF link annotation
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/6e6a2864bc5a2719a6f669c64d808f1f/97806387350.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/pedal.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc32d647b9---gelidijofe.pdfIn PDF document text
    • http://shosholoza.de/file/dodetuwixu.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/lonuroritarofunaronituvi.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/58022574772.pdfIn PDF document text
    • http://emaaravm.net/upload/files/82032677784.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/13886142237.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/10149304276.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607be7076f7bf---pesimorexerupizomitam.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/32796862274.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/jaiv7e7vjd81pf06el0p37fgkc/xubisixugis.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/16370812968.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608020ee1285f---65965425150.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/vonoxupiletalokam.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610341e5dd3c0---suleleratolesirofile.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d043ab14db---dezevuwujirisuw.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/b31f73bf848c5df00413ee3786a6c9b2/932327340.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf809f187d---69168420446.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/92129266350.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/texus.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/gopibibosumovedog.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/anmh603ms9a5iufeipqbr4e162/17138317731.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cb5e7e65b---resudinozojogedolotazoz.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/xobexunonelaz.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_off0000fb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6C 10612 bytes
SHA-256: c600f590e56a6de9ce7fdd3fec6141c793fec4f80205ca92d251846f4cd42244
font_01_sfnt_off0001137f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B91 17328 bytes
SHA-256: 6f9c7c710798130a02b231a383d32030292b19fc5b2d92b6899ac526b8b38b3d

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