Malicious PDF — malware analysis report

Static analysis result for SHA-256 8768a9d30ae1f241…

MALICIOUS

PDF

148.4 KB Created: 2021-09-11 10:29:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a33897c61665a06df20c5c43b7e0a375 SHA-1: 9121b8efde83912baaad6a965c5ec94c8d9e5a5a SHA-256: 8768a9d30ae1f241191cd6730be6f107687fcf7ff1590a3054a2baac4e5e01b7
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised or disposable domains. Heuristics indicate this is a link farm, likely used for SEO poisoning or to distribute further malware. The ML classifier also flagged this PDF as malicious, supporting the assessment of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7327

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://universalestetic.com/userfiles/file/62174101195.pdf In PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387ce01e323---vuzalogafefefitotejuka.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139008d79ba0---22416349297.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/fumifositumoliwolaxe.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/luseborimunatekiludiw.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/51790966050.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/wifefunuwekegukinezupot.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/19800308066.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/jogaminisajap.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339c7cd132a---16375869531.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/43539018058.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/wimipew.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/jivix.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/talijujesapobawib.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/81087373711.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/36190247449.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/48084795889.pdfIn PDF document text
    • http://rhondachem.com/d/files/mufewefufuk.pdfIn PDF document text
    • http://limoride.net/gallery/file/kirikudimefadawuxedanit.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/61852802661.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210906062718.pdfIn PDF document text
    • http://th-hl.com///upload/files/nosasoralamitavivin.pdfIn PDF document text
    • http://mcutech.net/files/22348677673.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=sons+of+behemat+battletome+pdf+freePDF link annotation
    • 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_off0001ea3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EA3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00020252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20252 10884 bytes
SHA-256: fea23e2f55250cc448f7c2fe9bcedd04772e4f70466dff762a86110a5bca99aa
font_02_sfnt_off00021b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21B11 19748 bytes
SHA-256: 9e491090620269b3985e049a19e6ef8f5db146a759c928cba2e5263555b0aac0

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