Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cdcb014a5ea8ad6…

MALICIOUS

PDF

70.1 KB Created: 2021-09-28 19:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c6b4e7db2d0e5cdf4aa7cecd4d0946df SHA-1: 61145ebab70611a6372c3cb8c8338c19c16bf63c SHA-256: 1cdcb014a5ea8ad6e5be8e01ffaba622f15fc422867057f2e47689ead016530b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classification and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://nomylo.ru/uplcv?utm_term=accounting+essentials+pdf PDF link annotation
    • https://danfort.lv/userfiles/file/35006860706.pdfIn PDF document text
    • http://battle.bpv.su/content/files/files/76228131570.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/51907401529.pdfIn PDF document text
    • https://beaszemin.com/files/61728232828.pdfIn PDF document text
    • http://hiniceshine.com/upload/76379901943.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210901091554.pdfIn PDF document text
    • http://pypconsultores.mx/userfiles/file/60345382631.pdfIn PDF document text
    • http://rrarental.org/upload/file/70690497982.pdfIn PDF document text
    • https://bselink.com/userfiles/file/toserorajumeb.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/ut7k38e0ruopf2adh5oai0h592/neduwewagugidimuresuxur.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16136820fbb951---nixidujevedozaxajil.pdfIn PDF document text
    • http://saimiri.name/upload/file/papem.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///68435025954.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/niwededipovozunapodinobif.pdfIn PDF document text
    • http://armanetti.com/images/45009299748.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc82a99713---mezuvemulabi.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/52050394874.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/xibenubimuduwomivijowif.pdfIn PDF document text
    • https://support-trevianum.nl/userfiles/files/jefonez.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16146ae8f02986---delusonumikot.pdfIn PDF document text
    • http://nature-revive.org/files/file/11540116027.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161425f13420b7---genuxo.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_off0000b153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB153 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC965 16176 bytes
SHA-256: 5497c8fb34fc5c49520380dbd34636fedfe299506fbbd6f1d4f3104cae2ba5eb
font_02_sfnt_off0000f23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23B 10776 bytes
SHA-256: 73241fa03433c12806803228bbfd58c90cbbf5a67e71d7635ac840916c382558