Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f421163327eb00a…

MALICIOUS

PDF

75.2 KB Created: 2021-06-28 17:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 003eb681940e8e479ec08d65cda9a081 SHA-1: e9473fa119549f713ac8d68046b7c69baabcbc47 SHA-256: 6f421163327eb00ace9712eaff63d358a1e5a7b772af69e5d5041e9c3327f0ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://ketchas.ru/uplcv?utm_term=sodium+carbonate+formula+by+criss+cross+method
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083b53d63a2e---vimibemeru.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/il4skmul66gk6dnrqkh3q4hbn3/gavagatuwopizivonajefu.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e04b816d0f---94337115485.pdf
    • http://nw-line.ru/generic/uploaded/64720410072.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d97a624f3e9---28187959378.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/60c0c65a1f654d788a1a5e678ee47a3c/mebogifexim.pdf
    • https://cavalier-hundezucht.ch/userfiles/file/34950222943.pdf
    • http://thunderstar.cn/userfiles/file/20210517091539174303405.pdf
    • https://oddluzanie.net/userfiles/file/boriredemularagotimo.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/93d8079a6ada8ebdc6b5ad6282ce7796/22897702213.pdf
    • https://alajuusa.eemedia/contents/file/994641607.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa91161fc56---mazofab.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/7484853a3237dfa8d9251cb4c240081e/jedewajabe.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/3457d4d471eec499a5149961e46a05ba/puroxiregiwixulovakim.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160989978c3083---65750818844.pdf
    • http://doubler-son-capital.com/photos/files/forikasunadixizexibuxavu.pdf
    • http://ahkjt.com/upfile/file/94729624241.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f62c71c286---lejugevigigejoregowila.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1427f27070---jokajuvevotimudurejekutan.pdf
    • https://senhewood.com/d/files/zejoduxinusisogavuwinewiw.pdf
    • http://vantaibactrungnam.vn/upload/files/29558930138.pdf
    • 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_off0000c1ff.bin
7187a37397475d02c6f68e8bc5ce83b7ce0c9bbc5aee8526a30636f1aeb7b992
pdf-font-stream PDF embedded font (sfnt) at offset 0xC1FF 16820 bytes
font_01_sfnt_off0000ed69.bin
31facd01d75961b1faee6c96c863eb821ed23497e9a274670ae5d0f578c43dd9
pdf-font-stream PDF embedded font (sfnt) at offset 0xED69 11172 bytes
font_02_sfnt_off0001075d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1075D 16792 bytes