Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1577d1e68a0a35…

MALICIOUS

PDF

83.7 KB Created: 2021-09-05 13:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5344780e33a1cfd3fdae6aa2d87357d5 SHA-1: 91f36c518d03c250141a305cc13cd7454bfb178c SHA-256: ca1577d1e68a0a35451a877602351578f9dcb5e65d44c64f5b4e5201edd7bf82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malicious content delivery attempt. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely to manipulate search engine results or redirect users to malicious content. The presence of external URIs and link farm characteristics strongly suggests an intent to lure users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=herling+grudzi%C5%84ski+wie%C5%BCa+pdf PDF link annotation
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c86347cd16---kapegaseditone.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6baee457c---61442780994.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607917a1bcf4e---76727236116.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/kjdlphe1virigkiju9lf8q5lis/6526827110.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/kc9p1da59or8n5lgml9tkhbumm/zagul.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/tcnpvu41qkmesbu9ti2uuitfa5/12281948554.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210803025905.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdc3aef0ef---59556690071.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/gim26rc503ta3e14a9qlntc1l1/furuvifidures.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db12a1bdb99---mejaditapidupofivav.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/dapojajezuv.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/somapejizoxopumunawefu.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/levepalawerigipolerevako.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/f859522413d1d63619d4d089edb34b0a/nelibademeli.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/d54ae5e5ff67f19ae6cbe823ed145e56/vomizozasaw.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94761908187.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/ladageguwafeg.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/5166146421.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/cct6os8a2cvc0h7ioacqq1mh04/safem.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/kijonerofidosebakumugar.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/wedud.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/rapizagaguwanoragipemow.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/laputozejolami.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/145d13417a2e5c032252e5acbbb06613/21040997814.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_off0000dfc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DF 11016 bytes
SHA-256: 3e734e7c0332cbd2e6cbab40fd23620450a6a288e66c324cecce30381e8b93f1
font_02_sfnt_off00011112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11112 18488 bytes
SHA-256: e7ef612e7cc0f645d655ffc68c18394c7824436c57db369ef90df95df0280a14

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