Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b61421329b88f1…

MALICIOUS

PDF

80.7 KB Created: 2021-08-11 06:35:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c6220dfc5cea62e71cff2b4ecf063a72 SHA-1: c6cd192785a1a7ee94db3ff47e64372e99e1c8e3 SHA-256: 40b61421329b88f1d58e0b8dabeae69611678f0ec8cde1b3e7369b85d4168757
124 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress sites or disposable hosting. ClamAV detected this file as 'Pdf.Phishing.Trojan', indicating a malicious intent to lure users to potentially harmful sites. The presence of external URIs and link farms suggests an attempt to redirect users for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3497

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://archism.ru/uplcv?utm_term=5+ejemplos+de+oraciones+con+sujeto+predicado+y+verbo PDF link annotation
    • https://rainbowfurnitures.com/files/files/kulagesivobotapiwe.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/gavuviroxola.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/015a505730bfc4608b552ca70a9b47b5/puvakoguna.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/nubowafupovujifabi.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/5988986255.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vumajunemujiwokuf.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/13212552479.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f41ab35ba5---torabumujibazanezabinad.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/bopapituderukaniniro.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b931b86e28---65911259072.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c65200d7cc---bezokozabaru.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/vabivuzalufa.pdfIn PDF document text
    • https://conrays.ru/f/data/80184275988.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/57510568320.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/ritadulenelimulevita.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/b90e0b71512ba43dad648102d8fe9310/23050802431.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/ivfg5s1ctt05aos2jrmkhsh0dc/duvikotuzojexofuwi.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/59052726821.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/7c602ab57b88668ae99e53c9d100520b/84657167359.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/15703282464.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085092f0bc30---98652902902.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/soxuvinararewu.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160784bbb693c4---lukupesefomefejeximibafa.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/lusev.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FC 18004 bytes
SHA-256: c2b9b3357c5457b8359ee95f40c51c1dac4d8b3b108a57e2cefb1e0624d771bc
font_01_sfnt_off00011efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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