Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b9ce8b128a04c5…

MALICIOUS

PDF

80.6 KB Created: 2021-09-03 02:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4caafd1c300ada5d839581a48c810ca2 SHA-1: 8cc8b97c350c03bb41d0752f6b8fca7768698f69 SHA-256: 89b9ce8b128a04c53b1824d5cea0072d2ea76963ee3523106cf6732eeec61fce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple disposable domains and compromised CMS upload storage, suggesting a phishing or malware distribution attempt. The presence of external URIs and link farms indicates an effort to redirect the user to malicious content or download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://inwebjor.ru/uplcv?utm_term=diferencias+entre+aprendizaje+colaborativo+y+cooperativo+pdf PDF link annotation
    • https://nabil-doukali.com/userfiles/file/fugonowudibunopesoboro.pdfIn PDF document text
    • http://muguet.fr/sites/default/files/file/lixiramivik.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b276aea5d63---33177657489.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fc926b40c---foveroj.pdfIn PDF document text
    • https://olterus.org/contents//files/69877008489.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/sasinisidareweruzesup.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608213c8a65b2---60737073665.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7bbc6ed91---61647338778.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f974fa452f---rovesozima.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/86914049120.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/56df39b48caed333ab83fcbfac2c2709/ruvurojasosuride.pdfIn PDF document text
    • https://ebooksweb.net/files/file/lovarurinano.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/69697901717.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/3183852875.pdfIn PDF document text
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/doxolumarojozomifi.pdfIn PDF document text
    • https://pindimana.in/uploads/file/24435149796.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160c549c22ebb3---bifojulap.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40126344268.pdfIn PDF document text
    • https://unosms.us/userfiles/file/91807259867.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/sigovuromupaji.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/152d9387f36d263d83ac1ea29557d62d/duzomozaj.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/16812679135.pdfIn PDF document text
    • http://amandamaitland.com/images/file/loxatajogemipeximewavuxun.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/jesivojusekofojejajalinar.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD237 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4E 11124 bytes
SHA-256: 61c87ae804f921e958963edf40f3df065d2d7b8ab547a2afa02d6fdc6875f94c
font_02_sfnt_off00010436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10436 19036 bytes
SHA-256: 1b75ae6805c3fbbb4a747c80ce27819243333a8cf14931ec3c26072c778483d2

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