Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b658d3f97137cb…

MALICIOUS

PDF

73.6 KB Created: 2021-09-07 05:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9e2884992854c64a44cc94624172b0ea SHA-1: 129be6559bda99436b1d8a61fe36adb58e1633df SHA-256: c2b658d3f97137cb42cbf7524f4d8aeb6701d3cd5f9e7600ecdd3235802946d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=stoichiometry+limiting+reagent+worksheet+answers+instructional+fair PDF link annotation
    • https://butterfly-propertymanagement.com/userfiles/file/60465688773.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/96691252372.pdfIn PDF document text
    • http://takemehometomatoes.com/ckfinder/userfiles/files/39440071585.pdfIn PDF document text
    • http://stpetersame.com/clients/9/91/91902b33218228c9a3691be2563b71f1/File/nebuwurowivizoni.pdfIn PDF document text
    • http://df-2.de/images/daten/file/forutiwafefuvuzoti.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/778117e7b2f399d9b4d2f04e87678aa9/29641298064.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/nupezemanusuromenatoga.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210715222749.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/aa0362b5bb4c97b0113cc8685566b542/webiziwiranaduz.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/79694293764.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/baruvafofijagalasepabefa.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/vapovireroseg.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/muzuriban.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6247b5ab02---15976057530.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/is6727ru6nhf5tnadqoetj32e5/77126865386.pdfIn PDF document text
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/6986374924.pdfIn PDF document text
    • http://suara.ru/img/file/fenawedoxavawasuzuladasu.pdfIn PDF document text
    • http://orem.mn/uploads/files/18244849111.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/texokamemozule.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/tamusa.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/4449c21d1b174a5cd5039bae6b8f3537/84284118543.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/19051948148.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/povesaxaxonupevoruzora.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/miwowumodij.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082b3aea4857---forasopexole.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_off0000bccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCCC 15928 bytes
SHA-256: 338a8a56edf8f52bc90300a0c8b0955911053f22d293b4e3e8cff335c0a2f3d8
font_01_sfnt_off0000e597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE597 11248 bytes
SHA-256: 234c35893cdd2d16c4b9618b5bb66ff1e830d7048b12ea14ddf24710ce850cc2
font_02_sfnt_off0000ffe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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