Malicious PDF — malware analysis report

Static analysis result for SHA-256 c75439b0455034e3…

MALICIOUS

PDF

109.7 KB Created: 2021-06-29 00:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b9e0d2be233fa1d818069054adbc66f5 SHA-1: ea4856aefd56b5630393f4f5b89f4b35c11272b0 SHA-256: c75439b0455034e3907c7a0b86ffd0168846c249af238a9629b99455d77f8dec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://bamfieldrental.com/userfiles/file/rivoruvu.pdf In PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/0d7ad74898c7ad5910c5e19d68b79dff/viriluwegudutomelajo.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/guvobidewiv.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b69b9262c9f---kokeser.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071cd303868e---67909205754.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202106/file/1624677334.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/297bbfbb2aef875f20f25706ee9fefa6/78336704521.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/31f2fcc0ad8549952f9b441785640991/jewugarafi.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609157ebc2986.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e55dbdbdc3---43624159398.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/dutakiraroj.pdfIn PDF document text
    • https://nevisnews.com/userfiles/6123375519.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/53417970224.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607941c86d28d---49375104149.pdfIn PDF document text
    • http://soupworld.de/upload/file/40451454632.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105140424284605.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/q7dmru442sn02u61a07nqs6dje/40308740010.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/seban.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/2b8662bc9c3884094ece8c96e5be6e29/77517719038.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/tigif.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210602_212156.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713edc45e4b---rarokeditop.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/aff7d62f3f1d49e73ba9e57a3f0eb303/juwaxigatizaxulalimo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=christmas+story+prize+quotePDF 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_off000146e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146E1 18744 bytes
SHA-256: 58642c57790ec79c4a768b33ebbed78cd410c8c057c8bd42e43a193726f08868
font_01_sfnt_off000178aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178AA 10816 bytes
SHA-256: e3f7524fa24b2edc006102e4749e0e9b6100e945694c3fd1d8256f1e87b77258
font_02_sfnt_off000191be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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