Malicious PDF — malware analysis report

Static analysis result for SHA-256 2239e4f119234268…

MALICIOUS

PDF

75.0 KB Created: 2021-09-28 17:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1436edb2ec3be139da71bf3d763ca6b2 SHA-1: 8b9574fb7206ede74b3b76544d7b1412e521cde8 SHA-256: 2239e4f119234268251dc2a588f1365fedee677e3a03f7cdf9770150e0ca74d8
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is likely used to redirect users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • 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 https://nomylo.ru/uplcv?utm_term=toefl+longman+answer+key
    • http://sugarfree-gelato.com/upload/file/wozivolexinosinugukexa.pdf
    • https://traffictkt.com/viking1/uploads/files/kowopixinevo.pdf
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/libeviwiwuwalolat.pdf
    • http://aostavet.it/userfiles/files/digijisasabo.pdf
    • http://www.rify.us/cms-uploads/files/18911128359.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc6c397abc---60367677851.pdf
    • http://carnow.jp/js/upload/files/vesazexelujofutuzusa.pdf
    • http://logicparcel.net/uploadsEditorfile/wiwuxamisidibitefijetoti.pdf
    • http://ptichile.cl/userfiles/file/61188136395.pdf
    • http://ph-easycome.com/userfiles/file/kajamaleloxuxepomevawa.pdf
    • http://charolais-hessen.de/write/userfiles/file/sajezapaduvujemekoje.pdf
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/15372513590.pdf
    • http://miyisz.com/mingyi/images/userfiles/file/49475569856.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614caac15798e---6124796028.pdf
    • https://washlounge.in/ckfinder/userfiles/files/tavogu.pdf
    • http://shangyi-pump.com/uploads/file/251059005525.pdf
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/15757534119.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae27657359---pizikirakamut.pdf
    • https://osakadentalcare.com/contents/files/jijiwuk.pdf
    • https://cfbadalona.net/ckdata/files/sovibigigusotididupoxe.pdf
    • http://come2menorca.com/images/file/womeke.pdf
    • https://olivierdaulte.com/ckfinder/userfiles/files/balujepojuwikupawekuf.pdf
    • https://supermagnum-bg.com/userfiles/file/78719208663.pdf
    • 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_off0000b9c4.bin
979411a62d00683d88e2bb9820099ad025b2d6c8123d34215fc7625e66794d2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C4 10624 bytes
font_01_sfnt_off0000d22a.bin
244c3b80c0122b35d51a2e7165e7f7760b5beaa3f6aab88a998b89ded6f2ee70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD22A 20016 bytes
font_02_sfnt_off000106eb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106EB 16792 bytes

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