Malicious PDF — malware analysis report

Static analysis result for SHA-256 75dad5aaebb4f9ce…

MALICIOUS

PDF

72.6 KB Created: 2021-09-19 13:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6b657ec610cf271b87f92097205ab8ac SHA-1: b2a2c37ba8452adc7a042cb29fdaf32b604899b2 SHA-256: 75dad5aaebb4f9ceeeba30e247a688fe75196bdcc3e39897395e531db45f17b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URLs, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to obscure the final malicious destination. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://garglob.ru/uplcv?utm_term=chart+of+nervous+system+divisions PDF link annotation
    • http://hockeydh.com/files/ups/files/zikizofiduxamurovudesivux.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/vuwagixi.pdfIn PDF document text
    • http://www.edgartownschool.net/uploads/files/marakedasazuratinizupabu.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/70599223356.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/lubonizikezalepim.pdfIn PDF document text
    • http://zenithmetals.com/files/dulifibajegatarolejo.pdfIn PDF document text
    • http://zzquansu.cn/d/files/jufexared.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/gufobotosasijogigaruzo.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/86638544696.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/putukunugi.pdfIn PDF document text
    • http://ildong.org/sa_upload/userfiles/file/20210903191842.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/80404557918.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/fipem.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/rojam.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/bakotugigovetaxuzilafeg.pdfIn PDF document text
    • http://katachizu.com/img/news/files/32765944503.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/rovobatoxikisuponugur.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146424715803---wuwobomure.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/jakeririkejadilaroku.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/velalatapugagigoxem.pdfIn PDF document text
    • http://svx.su/ffile/file/kuxodetelerenizusedoj.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/rukivajodugev.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/c9ca1cb9dc0dacd692fbfa81cdb04cbf/pirorimesa.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/28278577840.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613378a955880---wawelokokofokeb.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_off0000bc2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43C 15580 bytes
SHA-256: 6cb72a12972dafd7a0a76ad6aca62337717f47264bc3a66982d4fffeaff9c945
font_02_sfnt_off0000fbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC9 10884 bytes
SHA-256: 979fb0f381abbab66290c4981ab0745b3da01a7b2862695bacbd958ae658e384

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