Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc75b45981c0974b…

MALICIOUS

PDF

87.5 KB Created: 2021-09-24 08:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e46ed2f64bf6c9513e3d1417f6ab49a3 SHA-1: 90a3bc8c6ca494e3613b4eb85297b8014d619ce2 SHA-256: fc75b45981c0974bf9b4efce1b2f1f22e3f99dd4890faef5fcec96c727b43291
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to potentially compromised websites or disposable hosting, characteristic of a link farm used for phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://nmways.com/uploads/fckupload/file/9094936761.pdf
    • http://maryalo.com/userData/board/file/betafupalopunovulazede.pdf
    • https://salvatoredivilio.it/userfiles/file/jovades.pdf
    • https://cambodiaangkorhomestay.com/userfiles/file/23983877174.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/4a7fcfe9ed8f7d24a0f277cd0135eb2e/99292294691.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/11058b99b081b59b3dae35ec2abd263a/27136950949.pdf
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/11086231690.pdf
    • https://wanna-drive.nl/files/File/gefoz.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/8cc0b12aa47affd2228965dda79d3e45/7286477624.pdf
    • https://megalightgroup.lv/uploads/files/4651386487.pdf
    • http://zhihepvb.com/upload/ckimg/files/202109232303301377.pdf
    • https://agape4u.org/userfiles/file/16158100677.pdf
    • http://autoachtercamper.nl/userfiles/file/4509706178.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/8a9e184b84a793df7d19d4a39e05b6d5/nutugulixamarowuni.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342c99a5633---90438754484.pdf
    • http://vps73.juicy-group.com/editor_upload_image/file/wobusizudemofiripel.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161317f59d7966---43950666143.pdf
    • http://alarcon-v.com/editor_upload_image/file/678215752.pdf
    • https://aalatour.com/basefile/b2caalatourcom/files/kapuxigikikivuv.pdf
    • https://smilaxlabs.com/userfiles/files/vumenomumiwez.pdf
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/bolagexati.pdf
    • http://yejida.com/userfiles/file/19131910058.pdf
    • https://medgal.pl/admin/ckfinder/userfiles/files/20521510115.pdf
    • http://jysfh.com/upload_fck/file/2021-9-10/20210910184411385020.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/de038f2873fa6832f57157cbd68a8c73/1859131839.pdf
    • http://tianlanlawyer.com/filespath/files/20210910092250.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=best+android+game+making+software
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f404.bin
cbd85c9c256a7557400a9b4b78bf35c8bf647bd94b5723fd1fd9b985772ec725
pdf-font-stream PDF embedded font (sfnt) at offset 0xF404 10880 bytes
font_01_sfnt_off00010d10.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D10 16792 bytes
font_02_sfnt_off00012522.bin
e4e01608461b36889f21e863cbb9d77f790424e37c094a4ac4b089086405b72b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12522 16612 bytes