Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b10fa94d6fe4c1…

MALICIOUS

PDF

82.1 KB Created: 2021-09-12 22:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9100c1033b40493bc280a5148d743f99 SHA-1: d4af3be4114253f645f08d08aed01528c41c9ec9 SHA-256: 89b10fa94d6fe4c1c12fb3d34c33aae0c34a85180136a4fb45e7e8790804ef4d
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to trick users into downloading further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=how+to+export+contacts+from+android+to+sim PDF link annotation
    • http://topspeed4wd.com/ckfinder/userfiles/files/81969835334.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/bawalu.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/56924582650.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/85209917177.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/85640184830.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/nolagaxubugedurezu.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309fb795f3b---newom.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/xoxaruxodiji.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/regemelobutero.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d982e230a9---92389774922.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/nafekamomulawenadoporut.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/seves.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/4235244729.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3a40cdca3---27794285324.pdfIn PDF document text
    • https://destockbaby.com/ckfinder/userfiles/files/27849645155.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/resululafovaj.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///19767526691.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/f52224254ddb42c23bf1d24c640b2fad/sogoremewirugixosiwib.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/14632040033.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/zanalek.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/66184238101.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/50953691164.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613417c282cf5---samigogavafu.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/gogabo.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/xalijunoposokireminetupom.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba4b658a19---kozatofowibu.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/43236362802.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_off0000da0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF221 18412 bytes
SHA-256: 9072379703809587e1995aeb60f4427d98f8d65e9aad4228af613405c0edc496
font_02_sfnt_off00012162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12162 10916 bytes
SHA-256: 37dd4f5a4496fd28d64c5ad1e6d4d5d0aed6e31b8dde2d0886ff5675aa6bbf2c

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