Malicious PDF — malware analysis report

Static analysis result for SHA-256 c962eca64c4b9da8…

MALICIOUS

PDF

82.5 KB Created: 2021-09-07 14:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3e374d66557a86df079db6692009b4d4 SHA-1: 3089d8f2177c4f366d2f53d81efa392dd5d1c90e SHA-256: c962eca64c4b9da83f9e1b5581a0e071f644e8ab9763535837bbc157b2e74f7f
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 0.9955

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 http://laboratorioshamalab.com/userfiles/file/nepebomezikojupevabevi.pdf In PDF document text
    • https://onwater.my/uploads/file/51650895745.pdfIn PDF document text
    • http://lgassociates.in/uploads/momulo.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/xipesumozovazol.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/vivesisuxubidade.pdfIn PDF document text
    • http://shamayachts.com/upload/file/42030754469.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a994329e23a---41934200508.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/4780458596.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/nakekovurepodesojewe.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/11700650674.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/13526956276.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3a7c89931---zejunakalifupexepub.pdfIn PDF document text
    • http://mtcclassof81.com/clients/0/0a/0a45bd3013a8cc77df817aa526a911b1/File/vipomatatewunufazutinike.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/vapobivepisobog.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/zowejeli.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798c2fa7922---39063790820.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/36cf59c2da883adfba1bc7a0fd3cce4f/kukukebitarunu.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/kekux.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16079e2d22d8d0---vitajazenigibaxekobow.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/bagajizobeveravopuwujarut.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/deae8349c7a32081f4b059dcf83b75ff/63001837569.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f326bd003---48813121628.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a8040b75d---pakupini.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b891f174636---sujefonimes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=ableton+live+9+printed+manualPDF 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_off0000defd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFD 17152 bytes
SHA-256: 1de634f49e92c5947e9889135e18fe335d06ad0ead9f1bff8958abd12b229f9a
font_01_sfnt_off00010b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B99 10840 bytes
SHA-256: 2a645ccb9eae44e2803991188a8785edc2a5bd7df33ce3e467b2d3550889cf95
font_02_sfnt_off0001246a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1