Malicious PDF — malware analysis report

Static analysis result for SHA-256 9650c970968a733b…

MALICIOUS

PDF

69.8 KB Created: 2021-09-29 06:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: add2c63398793b4275c752de18e85a72 SHA-1: 4a04e205e8904d88a1f41e6a2d1d7fd69a1f2c93 SHA-256: 9650c970968a733b3be7dad9f68bcf541d12b9316be8368f890c86c92f506811
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The embedded JavaScript likely facilitates the redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://irlanc.ru/uplcv?utm_term=hidden+cam+app+for+android PDF link annotation
    • http://gevenschoenen.nl/ckfinder/userfiles/files/vuzupanosox.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/1630786284458381777.pdfIn PDF document text
    • http://one9five.com/userfiles/files/nifap.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161396adc870b5---kofuxuvi.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/85833892351.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/zoxawobisazexorovufibat.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-20/20210920071917852675.pdfIn PDF document text
    • https://davaocarrental.com/images/file/wegobozazaribimefa.pdfIn PDF document text
    • http://budka39.ru/files/fudijepim.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/51201291332.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411b63a2321---kutabidumipem.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/10094576789.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/nelogokejufek.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/zamolitupobuvozebetojo.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/dodegubexexevewiv.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/wigutilebujobokixakelomel.pdfIn PDF document text
    • http://imaginove.eu/data/Files/zafokasupe.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303505e7f48---limadivoput.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nutelanunen.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152bf5966541---3863829556.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/21837607462.pdfIn PDF document text
    • http://piscesappliances.com/userfiles/file/kosositasoxirusoxudeva.pdfIn PDF document text
    • http://esistore.de/userfiles/file/12416893873.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81584376437.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/sitedipuvudakejegi.pdfIn PDF document text
    • 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_off0000b130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB130 16032 bytes
SHA-256: a66899eafecc7f475be22df3305deff93fce0a9f38b4786e98ac0747c1c620e1
font_01_sfnt_off0000da14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22B 10460 bytes
SHA-256: ff822c9fafd070998ef610383d7dc38198bffb1d6214339bcb2db78e06dcf815

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