Malicious PDF — malware analysis report

Static analysis result for SHA-256 251e0684cd775d55…

MALICIOUS

PDF

73.6 KB Created: 2021-09-13 07:20:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d7d3d6fd17dfdb11c17ba113f65a6dc6 SHA-1: 849f6ff48ad2580e336bb21a1a573642db8750e9 SHA-256: 251e0684cd775d5570e25e7bc02f48c824d5b8ec91ccd8664720ce122098dafc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. Several heuristics indicate the PDF is part of a link farm pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://royalgoodviewresort.com/Uploads/file/geponatabosonetev.pdf In PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f46dc07ae7---85300486350.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/rulonupizonuxi.pdfIn PDF document text
    • http://atek-ent.com/upload/file/55838597464.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/mosor.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/pasujigida.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/21470228375.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/23103695560.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/38226499931.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/gagodawirigolujemi.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a83cc1fac---momavogep.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/85580572804.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613029bdc3075---napazabobevikigadigewejil.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/tevejaxepuzaz.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/16635793848.pdfIn PDF document text
    • http://shriramashramssschool.org/userfiles/file/6127398648.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/21701351157.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11272441271.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/39690164316.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/77976283439.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/petuwogexekudakedulifufu.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/80291713318.pdfIn PDF document text
    • https://fultoys.com/userfiles/tatetoratigefoga.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/31478532953.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=dog+emulator+apk+gta+5PDF 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_off0000ba4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25F 17744 bytes
SHA-256: 218bd20daf0e98fbe2d5ebe6dccff0033b459fbe68404419bfc4b47c78197e68
font_02_sfnt_off00010035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10035 10556 bytes
SHA-256: af7a851fa66a4b9610124e8422bbe8ac9a851bb17613896e7abaf08867eaa8e0

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