Malicious PDF — malware analysis report

Static analysis result for SHA-256 fead2a101c413634…

MALICIOUS

PDF

87.8 KB Created: 2021-08-14 02:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 977bb512d58e7a2af2a63c0972456da0 SHA-1: 61d153ec22c2c81920e8366be3ea7cbac8b0bd52 SHA-256: fead2a101c4136346567f0a3bccce18df5ef957ff69eeed8148c43bcf4d1b86d
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads, specifically WordPress sites. The primary IOC is a URL hosted on a compromised WordPress site, which likely serves as a lure or a redirector to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/in0g2r20ko5vsanbjhsie15ih4/wibinifamexiwowujunip.pdf
    • https://curryleafharleysvillepa.com/hang/userfiles/files/xozikimawerosegozurebid.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a733a3bf42d---75576252633.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9bb06a7c6---sibarepigufuruzufidopijig.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/c12c52c9d2ec9d130222f542ab9d3b2d/94733902977.pdf
    • https://vinacomvietnam.vn/uploads/news_file/15289386223.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6eec2924e---66495935399.pdf
    • https://nbcmedia.vn/ckfinder/userfiles/files/dupagapini.pdf
    • http://lsphc.com/userfiles/file///xawexi.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/a37f2d0b5ebb4dd1326c4a4caa8a1b27/varifuve.pdf
    • https://ever-progress.com/upload/files/39480672228.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d90f95de2---xiranakuvevisojok.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d83dedc154---8044721846.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084d22d66fb7---bojeziwiw.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62f0b980cd---41777317864.pdf
    • http://mobydick-band.de/fckdata/file/77677113482.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/t3rkcqptcl3uhof6cqe7um5ep0/lulinaporegisoxaxalep.pdf
    • http://aktifimmo.lu/userfiles/files/jolugebuloxexijiboza.pdf
    • http://rebeccafantarchitetto.it/userfiles/files/fizepewowu.pdf
    • https://studiopros.com/userfiles/file/
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c96020bef36---lidudepinaz.pdf
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/purigavobebesadow.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f003ed66280---24379268667.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/9c7da567c88cbb693249ea234ab3832d/44066599571.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094391c86332---46618543308.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=pokemon+ultimate+mega+ruby+gba+rom+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f105.bin
4aa096ced80d0763781b9b9276b2696e11e768639762c0d92bd685f1f500527f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF105 17900 bytes
font_01_sfnt_off00011fd3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD3 16792 bytes
font_02_sfnt_off000137ea.bin
3d6dfcc0872f416fe0444d0d3f217505f2ecf0544eed300fdb0f9837c6ad529b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137EA 10956 bytes

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