Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdfb8651bed05505…

MALICIOUS

PDF

94.4 KB Created: 2021-08-14 02:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d81bb0f9f4393eb5e1fd7e4e48e6af34 SHA-1: c3ed565fed47c1ac508690dbaf1573c0e9d72847 SHA-256: cdfb8651bed05505f6429b9b81e20014dbe5bc55d98cd73bf6a200d4f6d7358d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity, likely leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/9c7ea7fe8e8c8d1752ac4edb992f59a2/zodisirij.pdf In PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/fa4983fbe3e9868edcdf6c8413489f77/4608156950.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b11b26a2e24---12213757456.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839f8173189---11281605553.pdfIn PDF document text
    • http://splogservice.ru/content/files/30062014092.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/orila064he5rgdq1tc151iq7op/79627009713.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c009d05cc---48859501833.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/rosenisazu.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/85523030742.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce5e3ad142---piduzunulosuxegodefug.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/86708370454.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16083be54c9d0b---mububasudukojenabo.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/1335585976610ef7ee4f81b.pdfIn PDF document text
    • http://gpshardorawal.com/hemkunt/userfiles/file/24341315840.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4556d73170---23603902315.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/969ccb7a3c16b2dc8cd3eecb5ca843c6/lutitagelanagipedoxixo.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/fegoxekunifikek.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160815e2911d41---ravotamopukodefesi.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfb3a83bbd---76100086104.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085c763ba3ae---futedofomojumo.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/16196811058.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/36068e7ff4bee5a1ee9c080c6d728b63/35251160485.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/b20e67a692d4a784c82fb39db6d631a2/giteruwaxadomotukajojifux.pdfIn PDF document text
    • http://fullx.net/files/79206954465.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/202161672152661.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=distributeur+pneumatique+5%2F2+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1F 19788 bytes
SHA-256: a2a46fa58c82048fc928178af2981947861235e81b1e691cce12696a185ea1ab
font_01_sfnt_off00012f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F11 11168 bytes
SHA-256: 345148cf6eb39920c044a94b231857a8c054ecb130d339ecf59f90f639cdad3e
font_02_sfnt_off000148ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000160f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160F7 1852 bytes
SHA-256: b90ef3c925c1c5a285fce58c37443aacc93c2e65cda3d99e2a769ad6c9f5e4ba