Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbb963cf9b8c79d1…

MALICIOUS

PDF

74.3 KB Created: 2021-09-07 02:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 41a0b04cfa153654e8c4dd31d5cc91b6 SHA-1: 7573e7b55e8fecd6ecf6f81f5b035a1049324e6a SHA-256: dbb963cf9b8c79d106be2405f737b07c062bb063f3edcd7a82fd2ad35e9820da
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to redirect users to malicious sites or download further payloads. Multiple heuristics indicate the PDF is part of a link farm, with many URLs pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution campaign. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://kondicionery-vidnoe.ru/upload_picture/file/jotasekumagenuz.pdf In PDF document text
    • http://bijverhoeven.nl/uploads/files/46619662010.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/riwaloxumarigi.pdfIn PDF document text
    • http://chinahongji.com/d/files/vitakepowof.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078b075c856f---gigerod.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a346828f163---losisakaluxexoxiferi.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/66490203052.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160963838ccd91---12363403787.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16084971a2aadc---siwufategog.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcf265b567---nagerazojuma.pdfIn PDF document text
    • http://www.proyecpapel.es/ckfinder/userfiles/files/datepomez.pdfIn PDF document text
    • http://gphs84.com/clients/866382/File/63426972382.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/simurigit.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/5db0476f5a043e67974126812e6cac81/bujekivabenikikuvem.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084729f90d33---71832666085.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/gusosogukeloviw.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/1433923988.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/10484288097.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/2512718819.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/61699057617.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/todupidile.pdfIn PDF document text
    • http://tongdaidoanhnghiep.com/app/webroot/upload/files/51100778166.pdfIn PDF document text
    • http://eaeocs.com/clients/c/c7/c75ed17bfa54634cfc1039f1b599a7e7/File/34711800371.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/61420051912.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/78862998d7bb844a69603d5b83ae95d1/63996240017.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/kupowapoxulak.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2021.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/ruzejiwusozelisiboxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=psychodynamic+theory+definition+pdfPDF 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_off0000bffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFC 16480 bytes
SHA-256: a5ec69ef4235627dd2428a8d073a7d80f56d96f177cfa3459d3584d80e3c4c7d
font_01_sfnt_off0000ea12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA12 10956 bytes
SHA-256: bddfdc74d36d16f9ee47ab85d00c473044a5048f32cab14c959e936458471957
font_02_sfnt_off00010353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10353 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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