Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe8cc4abcd6cc383…

MALICIOUS

PDF

89.1 KB Created: 2021-06-29 10:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9d8484b6cf1817d64582601ec16139d5 SHA-1: e36ee3c118118a10789a68b7d48ef34c616720b0 SHA-256: fe8cc4abcd6cc38361fdc0732359a05a9bed59244f45b7da2d4d2f6d441ff383
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF that contains a large number of external URLs, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, suggesting it is not intended for human consumption but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://inwebjor.ru/uplcv?utm_term=square+by+square+drawing PDF link annotation
    • http://belst.by/upload/file/siwagututudisasaturamogi.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/ratazibasogexajotije.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/77ffe200cbdc9fe69972eb7d176a189f/50955999581.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/nejulawapomipobotirenu.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8fcceec1d---vazonukozupe.pdfIn PDF document text
    • http://katachizu.com/img/news/files/segefomasomawemelov.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/10340880351.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/19645333181.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8c4b10729a---58821264301.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c75036188---lekip.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/wedakexawobevuzawu.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703547dfc34---besovosopivabodiju.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9f4c53008---47008450792.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd57469523---7393144817.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210529023027.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210628_8E0AEC9149C016A9.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/b79f0842a523b9b5512187382fcc936d/80531012700.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/81307931125.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/90b40e1af21f7d2e8f9e1fa05872b6ba/38465030079.pdfIn PDF document text
    • https://hsse.cl/files/ravipagagalalis.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/86176064251.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/f3490c6bb05faf22f4d3ece9991cf5cb/kamudoxuz.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/76300402314.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608c28d0b1361---tuxewidogomepatoxunijediw.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a4620d49d---vaxisazar.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4C 18244 bytes
SHA-256: 5f09f18eac5429ddc4d41eed55063334610204329fef889cc8580efd72b33a48
font_01_sfnt_off00011bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF3 2296 bytes
SHA-256: 0d91b93c30cdb4b9fcc5287ef31e0f6d3b75050094e35c3303e90e7f2c1d387e
font_02_sfnt_off000125f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E09 10820 bytes
SHA-256: 5a2f3d40326647208c730c13c60a8025b4dd4e3d0d32c1a3f4a3fdc02f4e1da3

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