Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dce7f19e8863d84…

MALICIOUS

PDF

73.2 KB Created: 2021-09-07 18:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0dea85446863961f1cf129b4e679474f SHA-1: 8115700bd714270118183ee1c420b2346db9c652 SHA-256: 4dce7f19e8863d843fffef0201b1443d5098d8e435d2cbfb38b905bb671a8506
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The file's structure and numerous external links are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://madeirashopping.com/userfiles/file/lalulobofusizedoxowudan.pdf In PDF document text
    • http://tryinvest.eu/userfiles/files/dadukal.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/2b277cd30f6295a4459c99a9f18c6aa4/ravawezojuwin.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607774d62791e---73420642671.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba66817964---jukuxawojazaxi.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d77f94367---61643981318.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/65960666235.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/74398394490.pdfIn PDF document text
    • http://gibisch.org/files/files/50014125732.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/20375363219.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/3131322205.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609d816bb4dd2---71610871659.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/o8a74un5tnheo4grnp0sbkumhu/zadesisekikefaduborebanog.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611884af29a09---77180013563.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/fupolowamafe.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/30229734047.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/k49p85dltptqr69b65fvcaasq1/legitam.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/megipijexaloweriforum.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16085f7a0debda---witozazulebabiwuzep.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210823_A0BDE1368BA2B221.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/12e7e1f15191f6327797acca76f42d25/73279097543.pdfIn PDF document text
    • https://uudanbury.life/files/file/lurepazokoxasexetodip.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/3007a660c28665fa808c9c19ca7d0097/73884060508.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/6cidmsnfk5bo9ca9192mdo9huo/10247854124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=ordinal+numbers+worksheet+year+1PDF link annotation
    • 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_off0000bc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3D 15868 bytes
SHA-256: eb9536116638cf22010fc7637a5ea98c4fd627f0ea3b7b4f88c61c6e7737123f
font_01_sfnt_off0000e4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E1 11120 bytes
SHA-256: bf9cc4ea0468ed0e3d2d9737ecec3590c7e325e8408e9f00e9f92c8d003c43ea
font_02_sfnt_off0000fec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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