Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b7ec71ff00893b6…

MALICIOUS

PDF

92.8 KB Created: 2021-09-04 22:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3831d2f5359fbc5de6da8db8a62105ed SHA-1: 304ae1032d52938debe9f2e3b3102eddc52e56a2 SHA-256: 9b7ec71ff00893b6b0aa5eefe43288af589621e8af690b0eadd11fd4912f453c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. Several heuristics indicate the document is part of a link farm, with many URLs pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://tajesink.com/Uploadfiles/files/zixibirawakepasuse.pdf In PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/97f38crqh2qnbrbbil7gcf8202/69943856521.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/foforuwukopilar.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210715_3976F24974F8A422.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fe39859ee---36487770603.pdfIn PDF document text
    • https://rinducm1.com/contents//files/jolufilo.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/winesagadizakufijem.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/7475cc20667ac8e7a2807c6e35dda5ed/21704455396.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/xupija.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/zumamibowejufajuz.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/36501483036.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/rv1nqu06vp4ipelcdvr5lc0c8v/besuruvozakavabububazub.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/napufigepidupe.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d86f27800---nurosexodetilox.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6769e8dfe---danuxafunakir.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e603692f3f595bcdd88afced3c8e0c83/92280718584.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/20442164799.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/30358238858.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/daruzokefekelojofomosere.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607271d46ab93---vefibos.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f2aa27706---magupefikedarugodub.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/pagunitetod.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/56a1ca35d2a5a029e4747034efa7ec45/73490584346.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/869deef5fd6765fc9e7bf0fe713d7879/55964361063.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=pandharpur+bus+stand+time+table+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_off00010567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10567 10884 bytes
SHA-256: bd1ccaae3fda5858b17a3f4ff0e2e99bae9fe9a7e1a6a82a35f24d32630df843
font_01_sfnt_off00011e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0D 18348 bytes
SHA-256: 462be7ac5b6be9eeaa1c5609285028b7a54283d34e636865299fdc2087c9b0ed
font_02_sfnt_off00014df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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