Malicious PDF — malware analysis report

Static analysis result for SHA-256 c41f00882c87ab44…

MALICIOUS

PDF

70.1 KB Created: 2021-09-24 17:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: af8688c0b9d5b525175bef724cf26955 SHA-1: b3e74d59402e3d5ca36ae2ef0d41463ffc0a9b39 SHA-256: c41f00882c87ab44fa74070608b03a9158675c016e16abc3bea82bb931754a8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised or disposable domains, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://navliecky.net/userfiles/file/ragafizoraxekaxipobudo.pdf In PDF document text
    • http://network-italia.it/file/859190956.pdfIn PDF document text
    • http://taociren.com/upload/file/210910071314725436lch9jtir984a.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/67977339075.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/mukalifedazusakuradi.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe88fc87a1---36892692189.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/zimitirebomemepuvalo.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/xexovevefowoza.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/51688903261.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/webuged.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/if542vhj8ur628bcgkrcjnrjc2/vumofezuxumewib.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614164b45bb72---xuvulapa.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/73220010900.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b13321df99---75818324274.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc14dbed4f---15704342558.pdfIn PDF document text
    • https://webmanagement.colortown.ro/images/file/tekidatapulaxenonaji.pdfIn PDF document text
    • http://protetyka-lublin.com/images/wyswig_images/file/57465324165.pdfIn PDF document text
    • http://sujoydhar.com/userfiles/files/47260086514.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/muxibuvibonerisaj.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc2e31c4d2---sigezokatulajenugu.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/31866701671.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341c73acfb4---79246245308.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/jififusupax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=cashier+3d+downloadPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/6da6c217024b744310a68a2daf0c929b/78217532191.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_off0000b049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB049 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC860 10536 bytes
SHA-256: 04ecc0a0e32a87177d9a60593c22a4958352af3b7a56b8f73983d0f034f2e304
font_02_sfnt_off0000e061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE061 16224 bytes
SHA-256: 4929922bf9662ad46f5215a197f8e7ffd48cae076df1e078829ce9ac7b9bf018

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