Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd175c8d2f15e119…

MALICIOUS

PDF

79.3 KB Created: 2021-08-15 20:36:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 4e0109d41c4bc897418cdc59a386508c SHA-1: 785202495cee1db562b6adcf5478b39d71c49096 SHA-256: dd175c8d2f15e119e8300b0767c5956f412d38b75b3e14ff08c864e8a4db7e7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=how+to+configure+nanostation+m2+as+ap+repeater PDF link annotation
    • http://sumtinathholidays.com/admin/uploadfiles/file/14995863991.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/duzuva.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/69857346279.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161154a874223a.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/nujif.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/dc7508f850535bd0c3f0397887db83c2/gigaxomiwix.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5c27aab0f---rurofika.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210512112543.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/woropafotewim.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/9616d5db1af14ffaf02e352889d016f6/magas.pdfIn PDF document text
    • http://gurukripapublicschool.com/userfiles/file/55059255032.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/pirulef.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/43014577554.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/nojur.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/safojo.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/126683495.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/pirazuvaviragotutuso.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847261a3f5e---842072850.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094aef4af5da---59981001132.pdfIn PDF document text
    • http://hms31.ru/img/file/71717058872.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9cbc2dba4---fobuganasuxonibi.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5c9237c24---66268908792.pdfIn PDF document text
    • http://mousike.it/img_ins/files/31132594221.pdfIn PDF document text
    • https://parc-hotel.info/file/fojavelivonobuzadatevix.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/83040955311.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_off0000cfe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE8 16720 bytes
SHA-256: e7984912b19051bf7ce0973b1adf7697c080a69fa6a00a588910a35471e58192
font_01_sfnt_off0000fb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11356 11072 bytes
SHA-256: 2ecae9dca203e6726cae8107a1708d1e50a04aea1079fa6dacd020b2c3682505

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