Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ef7e54fc6b9f12…

MALICIOUS

PDF

82.8 KB Created: 2021-09-11 17:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2fc8e273849eedb47448192151ee6a83 SHA-1: 958e43d6245a8e6cc9cf27dd75e4fae50694d0d8 SHA-256: b9ef7e54fc6b9f1253a8df98cb6453ec39581ba2645112f871a1a846aef5c4c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised or disposable domains. These links likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://medvor.ru/uplcv?utm_term=gaming+kernel+for+redmi+note+5+pro PDF link annotation
    • http://mywayrtk.info/userfiles/file/lajevu.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/5181879586.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/78913615439.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/30341548155.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/19540297434.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/fidowowosup.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135aefd91267---tigenumirefugusidawinaxa.pdfIn PDF document text
    • http://agavietnam.com/img/files/92895849941.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/45183201995.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/35645887459.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/70905358960.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/divotorobatezasumud.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/kexogimunemitimiki.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/siwudelalu.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383d8a01fc3---weropurakiv.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/65402605596.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/1608135646.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/senuvinerozeju.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/65918324243.pdfIn PDF document text
    • http://dongphat.net/upload/files/92623164462.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/rezasunuxawop.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/69530798252.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210901122744.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/8dc456b44889feb3f1eb9b7b998c39ad/wubupubuwenox.pdfIn PDF document text
    • https://n-tlg.com/files/file/15816231170.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b9295dbeb---59608287549.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_off0000ddde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDE 17712 bytes
SHA-256: 271e6bbd460d57141bb7dff0d05a77dcd0c56c5e8142b2166ed233a5a05092e2
font_01_sfnt_off00010bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CA 10940 bytes
SHA-256: 59881660605f11e91c4e9e2cb11bb78d118fdb4edc73d92759c9a2655f39351c

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