Malicious PDF — malware analysis report

Static analysis result for SHA-256 2970fe31257c9603…

MALICIOUS

PDF

70.8 KB Created: 2021-09-28 07:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6f5c989d0df0430d753fb4d8cc43a06c SHA-1: 027248d4fc5ef1d0ecc5eb4dbf5570f6623b542e SHA-256: 2970fe31257c9603ab56fcdc826e33c99b901f2a627323083f996c45540f7c8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://divyabodhanam.org/userfiles/file/rinimuxeruninemixiwawem.pdf In PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/11438652947.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109240210585433.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/55629905542.pdfIn PDF document text
    • http://vodova51-53.cz/files/zepaxojuzisexijowepuropa.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/52954906801.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613daf8703ec8---36623449527.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/29264214685.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/lerixukekabezegubojapul.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/52561469699.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/leronibusidej.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161524b5f519fd---38347550769.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/forozawoxu.pdfIn PDF document text
    • http://enricobarraco.com/files/99569107639.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/xaxuwa.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/xonuxijofitejo.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/rumanalilikixukubenesuf.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/basiji.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210905095251.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/a52b5281fa5e1a8858dc4d0b8ad9f56d/wasunipunabesiv.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/damakukubu.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210926224355.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/278ba4c1cdb8086b7be3ac52d56bad32/26673226732.pdfIn PDF document text
    • http://myatkinsonfamily.com/userimages/fojafosidojugoge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=best+software+to+convert+pdf+to+wordPDF 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_off0000b0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F1 17092 bytes
SHA-256: c03db6fcbb1e2428e2ed12efdc734801c0bd9f5a9dc925e08912c67583ad6f16
font_02_sfnt_off0000f4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D1 10680 bytes
SHA-256: e6771eb51375fb7eb3d2815719f573667d56643f21c51b7a7519b4355f4790a7