Malicious PDF — malware analysis report

Static analysis result for SHA-256 461db0f9808fb76e…

MALICIOUS

PDF

75.9 KB Created: 2021-08-15 03:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 41770e82affb5102a14e73147b03b909 SHA-1: 7a169c3509dc7a269d1c663e309b953b0358dda2 SHA-256: 461db0f9808fb76ead9af4f1c291f2e29d8ede7e38401ebca0bfa8dc44259214
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the structure and URL patterns suggest an attempt to lure users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/54515877438.pdf In PDF document text
    • https://royal-art.pl/uploads/userfiles/files/tisasepewev.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/17105232402.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/t5carjtgp7escviv8o6a9b0v4c/96747062714.pdfIn PDF document text
    • http://qdjshg.com/files/file/29282257649.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1b77f2a8a---24718713779.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/80021730801.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e6651ac5bd2---newedogitisikagi.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/97830296631.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b76358bd9fb---fovosax.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/85007a276f3251ee7f64cab2faaf3ae2/zibedivigowekuroduweboles.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/mofafulixuwulobiju.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/dmqoqaefgib0glarc6tou629s0/geviwojufebosapovinorani.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc6ec941f76---29580242393.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/78027969148.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/savugipivez.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780b43e470f---73243015124.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/87916298721.pdfIn PDF document text
    • http://jfe.hk/userfiles/59339473887.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/nurukowifesaketukedet.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/wosag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=graphing+polynomial+functions+worksheet+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC220 16052 bytes
SHA-256: d80c99e1fb08c17cf5b085a6abe70ee0a37ee638c123a0d2ecd4f3eaed0a1565
font_01_sfnt_off0000eba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA9 11496 bytes
SHA-256: f152d5a7b2fcda0a92e0784155d5a8debed22bf83cf95f6d13cf5ee7aa227c6e
font_02_sfnt_off00010699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10699 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1