Malicious PDF — malware analysis report

Static analysis result for SHA-256 27cb69cfd4e37843…

MALICIOUS

PDF

73.6 KB Created: 2021-09-06 03:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 6a0893c9588f054b9eb5e8ee0f7e6bf5 SHA-1: 9b014ca7f77b8f3a516978e4e3346d68c3c185a7 SHA-256: 27cb69cfd4e37843b9b1fbfe42b7f02f6efe8fba169608a2a0d8efc43e8c127a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/f33dbc80ffa7deaebad634fca5abfa6c/fudugibov.pdf In PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9c8f5b2c1---83764132777.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/61110726108.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/55656982859.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/36167821444.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/voxazavoxif.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210621130516.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/amobnc765beqslpqpckc4h92p3/27412516537.pdfIn PDF document text
    • https://taperagi.com/contents/files/suwilidoxamomuxipemozab.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/a111bc9ee375280fc6b273bf3c47c7cb/84598163041.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba35dd48e5a---49032999724.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/zuwitil.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14df5b2536---xaxalevofukowitigi.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607720a942b61---11349150229.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/72160907425.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/jaduronamepazavefulos.pdfIn PDF document text
    • https://tdfstore.it/file/24815105977.pdfIn PDF document text
    • https://semangkabiji.com/contents//files/sotuwuxu.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/6baa1c8dbc501819f89d934d854cc60e/begenajajotafuzozi.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/tivoron.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/ninageduxiwovax.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e09190ad3b---4802138531.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=common+mistakes+in+english+new+edition+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_off0000bdc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC9 16144 bytes
SHA-256: 5cdfc5aae796b6720d33f06aab73a3ec251e9b7e271dd3726b08a85b4691a464
font_01_sfnt_off0000e68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68C 11052 bytes
SHA-256: 96311cc4cb5d7cbc1d4e45fc03e77d82fb5284f10514ed2df57023e417cb485f
font_02_sfnt_off0000fff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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