Malicious PDF — malware analysis report

Static analysis result for SHA-256 db96793c8f799cf6…

MALICIOUS

PDF

68.9 KB Created: 2021-09-24 14:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d2d4cbcb2714286459c1f3100b17a97 SHA-1: ca6aa4341f21b833f0bd58d2c758dbc5fe36ce14 SHA-256: db96793c8f799cf6c3459bcfedc2fa4f6b19ccd18481273c4e54f352594573d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many of which point to compromised CMS upload storage or disposable hosting, forming a link farm. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://marmetal.cevhertemizlik.com/userfiles/files/89370215795.pdf
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/kemut.pdf
    • http://paroissedementon.fr/upload/files/76141641283.pdf
    • http://www.bongbansaigon.com/uploads/files/mixafusubiwero.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148369c910bc---77331710806.pdf
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/gofowukelorik.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133bd1458372---ditivepegoviw.pdf
    • https://ibliberia.com/ckfinder/userfiles/files/kexurejawaxubukiwek.pdf
    • http://lighthouse-connection.at/myPix/file/80313406648.pdf
    • http://iraneto.com/basefile/iranetocom/files/vuguxepewisov.pdf
    • http://burattinojatek.hu/userfiles/file/xumagozuwuzu.pdf
    • https://mtestbd.com/assets/uploads/files/65681318486.pdf
    • https://kolegium.inaheart.org/upload/files/megumepukukamume.pdf
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/lafunid.pdf
    • https://tbsva.org/Upload/files/20210910023009.pdf
    • http://izumrud38.com/ckfinder/userfiles/files/xijumarex.pdf
    • http://liily.jp/upload/file/20210923072139.pdf
    • https://euforbiabulgaria.com/uploads/pages/files/10717516013.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc6bc3d869---sivigujep.pdf
    • http://nissanotogovap.vn/uploads/images/files/70837475839.pdf
    • http://wedooverseas.com/userfiles/file/88605766675.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=multiplayer+games+apk
    • 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_off0000ac46.bin
ee07ced291544fef46ca763ef5894767d45874f92d47ab67671ace3d15dab32b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC46 16296 bytes
font_01_sfnt_off0000d626.bin
711a2b3996283155c5ecac94af20b995110334ca6ce51b8dbd92fb3d850d6158		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD626 10672 bytes
font_02_sfnt_off0000eeaf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAF 16792 bytes

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