Malicious PDF — malware analysis report

Static analysis result for SHA-256 530955fff0196653…

MALICIOUS

PDF

69.3 KB Created: 2021-09-23 17:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 83dca0fbff34edd606a087ac85758cf1 SHA-1: 0dc91e356138522e20b89f3c22966747cd9608ae SHA-256: 530955fff019665332d96858bf98025cdfc0556569ed19e22baf31c396f00bbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://oniceh.ru/uplcv?utm_term=fishdom+unlimited+coins+and+gems+apk+download PDF link annotation
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/bopinutaxejo.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/98932688508.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309113a08c2---46704806005.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/fetusidenetusomoxu.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/35768813103.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ce66d34d8---ramipexibizuti.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/ditux.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/bikijonikawi.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/vepos.pdfIn PDF document text
    • http://ymmicro.com/files/files/kilowamotanasavanet.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/nubejeduzimurewetozija.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/34318882800.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/dokemurajugug.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/fikusatadijozamosepirome.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/39502267974.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/bm17v0p4qo6k8g8qvd37treei2/poragolevo.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/33399639078.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b1963ed32---kejesojadojaramuli.pdfIn PDF document text
    • https://emenu.hu/editor_up/79425181899.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613060bc8fc38---37167318292.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_off0000b161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB161 14644 bytes
SHA-256: 0972f55d866b19b632f2034785980d88b28b90bd98aa2e42dc4dc99e4293c468
font_01_sfnt_off0000d5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DE 11116 bytes
SHA-256: 36eddf0cf20f1f611acb598ed7c9faa243e6f621dbd862de4d73d74d7f17edbf
font_02_sfnt_off0000ef7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1