Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc1c988549531e12…

MALICIOUS

PDF

94.5 KB Created: 2021-09-14 02:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4e91ba8c4af167c4672d488451c88424 SHA-1: 19779b7e28a6db2ca260e6a54282c21a0263a6d7 SHA-256: dc1c988549531e12b057ad0525e4a52eedb75894db31d604165c51806dd143c0
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised Content Management Systems (CMS) or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of multiple external URIs and link farms suggests an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://zniczekowalczyk.com/user_images/file/83316266346.pdf In PDF document text
    • https://soswzgierz.pl/web/uploads/files/gusopikovidokudidubiz.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/gozagepejezipowed.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/zezasizuvemujogazabe.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/rodigegokig.pdfIn PDF document text
    • https://onecre.com/images/content/files/fenipepijinatojoz.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf6f4917f3---3305322647.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fcb57905f---21952461969.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/1208451756.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/43383325760.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eeb7da576d---natibuzabenonurumiwunudel.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210905000302.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/radit.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/16001292403.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/zitozoji.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/wanal.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/tupivesidivosemi.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/jujepidiwivekawixerasup.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ravuvaliviwexadiwav.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16133f3d2e591d---11363993619.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/degutamifiva.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/sifenepujuw.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/6qtkpqhe6vh01djfafbi0rv5aj/ruxemak.pdfIn PDF document text
    • https://netpage.info/userfiles/file/vujikiri.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/30a07e92df14a5881395ccc79e79f793/29831312905.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/61960530211.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386a3517875---vikumexofezemere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=watch+boruto+anime+freePDF 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_off00010f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7A 10620 bytes
SHA-256: 6c53db9834fbc11d5117b5fe9ce3e87c7508b496008e533032fa1373a935e337
font_01_sfnt_off000127a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB2 17248 bytes
SHA-256: 42f2b5cf5533e781fa7cc57e3bf819ef3e09a522be125b738eb275f28950c3cb

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