Malicious PDF — malware analysis report

Static analysis result for SHA-256 06de9de85ea13ae9…

MALICIOUS

PDF

76.0 KB Created: 2021-09-16 05:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9b83d9b798820e6e738241b4f0f5c3e4 SHA-1: ff4bfcd545a1702ed82bca8bf4a42e4618192f5c SHA-256: 06de9de85ea13ae99c8aab08a3fd95a436500e4f1ae146f1d8d583c84b2cdecf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to compromised websites or disposable domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://catamma.ru/uplcv?utm_term=indian+idol+winner+neha+kakkar PDF link annotation
    • http://zsmnowakowski.pl/userfiles/file/gubumoxakenem.pdfIn PDF document text
    • https://securitydm.com/slicice/file/45854621619.pdfIn PDF document text
    • http://thcscatquea.hoaiduc.edu.vn/ckfinder/userfiles/files/suxifu.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/71238598747.pdfIn PDF document text
    • https://haidangpc.com/contents/files/96659182066.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/63775171065.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/rapopenajoka.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/54111117789.pdfIn PDF document text
    • http://bavlas.lt/ckfinder/userfiles/files/24442362391.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/47124719920.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130dbae101d6---baxewipikixi.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82963989313.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/nunifumeku.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/d03fd43dc5d022d12b7d97b4fd958206/18177719068.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/lasaziwot.pdfIn PDF document text
    • http://odumakus.com/uploads/files/1348983278.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/rijigupolixozaw.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/59759702008.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e616537491---nemokunep.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/vanar.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613993f546d94---xelalojukevuxefewukoxe.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/mujopejabagepabuko.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/cdf284247ba6d5f7096fad363d23f640/sevut.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/40161373539.pdfIn PDF document text
    • https://rais.bg/uploads/file/99114744153.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_off0000c3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFC 18456 bytes
SHA-256: ceffff42d7437b9408314bb9a97f0ce398fd0297af22c36874a5f2503f78fab7
font_02_sfnt_off00010be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE3 10208 bytes
SHA-256: 02ecef3673915ff689838540a57911e497551607df076aa078e36c58154af82b

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