Malicious PDF — malware analysis report

Static analysis result for SHA-256 6779c370027ddfda…

MALICIOUS

PDF

81.7 KB Created: 2021-09-03 01:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eb0dca5f299944a7b75059e147cefa2d SHA-1: b9d33e3b5cc7a3a7fdf60d3ac3e73af033fba247 SHA-256: 6779c370027ddfdaaa50ab6d1bb4539770a098c45df7b79129a858b4f4753c43
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on potentially compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded links are indicative of a spearphishing attachment, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/tuwajubawewusa.pdf In PDF document text
    • http://shengnabei.com/uploadfile/file///2021071708465511.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607292beea37b---50473753353.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/1ec9cf5892daf1d1f905d47c4ca9eeab/suvolo.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/3509868569.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/meroxirura.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/62931997563.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/9l8mhl68hu9kuoteen5408kra2/zaxun.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611631df1bb6f---2668745676.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/12552142919.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/xuwipigigawaboteniwir.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160809d85d5fe8---giborifeboserosazogo.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/6ffb46930f3d53e8cadb66cd59003f5b/bezulogiworekedimiba.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/pabanotazukodiwemid.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c363e7cd5---78296053039.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/punubalabewepe.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160734e9bb2735---34951225099.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/25567920521.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/90323509803.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/a3ad02d9239c2ee3e0e95e55afb33ff4/79196859490.pdfIn PDF document text
    • http://chemicalengineers.ie/images/pebijuxu.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/nesodazuvegodafawamatoj.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/63899585086.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=ruger+lcp+2+manual+safetyPDF 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_off0000d88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88B 10992 bytes
SHA-256: 6de025995a3940f03fbedf32202a01271d8116d013f1a97ddd01138cd31eb4ec
font_01_sfnt_off0000f230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF230 18140 bytes
SHA-256: 056d9dea5352cb2bb1cdc599cca97b56402005f8b50d0a434eebce1be4c5339a
font_02_sfnt_off0001210f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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