Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3297fc17baca7e…

MALICIOUS

PDF

75.8 KB Created: 2021-09-17 07:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7e6c1ac8899cf49e24df8133d33f10aa SHA-1: 6e2a2c70da61b9572d810166fe722e588dc80a4d SHA-256: 8c3297fc17baca7e02c3fd6b09f436e6bbc79855ce7af1981b6e2cc05bffc7b5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. This JavaScript likely facilitates the redirection to external URLs, as indicated by the PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The presence of multiple links pointing to potentially compromised or disposable hosting suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.trisad.kz/ckfinder/userfiles/files/99213700012.pdf In PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161425708d0115---gexuzoxinapexorokijefe.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/62131210907.pdfIn PDF document text
    • http://edallyshop.com/upload/files/86574912440.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62817205189.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/melelalutagaxo.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/87048332539.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/zaxogewizis.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/60656933862.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/346a25be2eb59dedbded99a74791757c/buvufubek.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/89291318956.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/6pu2ja2msk53eqtp9r1u1igtml/zuzajidaro.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/161369c367c274---51258900098.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/pemovega.pdfIn PDF document text
    • http://classtool.info/upload/files/4897255960.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/telonej.pdfIn PDF document text
    • https://nistd.in/userfiles/file/dekiputeb.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/23874693948.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613504e4a945e---90210936691.pdfIn PDF document text
    • https://mlspoland.co/files/file/sikoparisujerokezevel.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130d50b14e7f---sazul.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/60631277615.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/32836694949.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=convert+excel+file+to+pdf+filePDF 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_off0000c6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F2 16608 bytes
SHA-256: 04970b2fa7cc3a3d83f789e58de753ba7674aede22d29931aeb7a22b9b8bfbf8
font_01_sfnt_off0000f1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C2 10484 bytes
SHA-256: afb98029e0ad86c0d044da48b81633817f798b7c14f0c8f4a4bd83c82954b750

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