Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ec62e796b426d32…

MALICIOUS

PDF

81.0 KB Created: 2021-09-03 09:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bb2243fd9d4057e579896656708e3330 SHA-1: a260a2156bc351c17224290a4a46ae70c9ef5fa7 SHA-256: 3ec62e796b426d329a49d43cb55bcd824644c2724598c40bf59319a67deedc50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm, suggesting it's designed to redirect users to compromised websites or phishing pages. The presence of embedded URLs and the nature of the heuristics point towards an attempt to distribute malware or harvest credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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
  • 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://crysiq.ru/uplcv?utm_term=k5+learning+grade+3+reading+comprehension+worksheets PDF link annotation
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612353ef35aca---xovalowotexa.pdfIn PDF document text
    • https://renault-service.com/userfiles/teferelukugiwuvulepezajof.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/kuxarifapo.pdfIn PDF document text
    • http://grupophi.es/uploads/files/86659757995.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/e309d1735c961bef597ee559ecb96a1e/36423170899.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/68980444417.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0e0f2fc32---mubozimeseja.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160ee53fc16871---37243916571.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/52645523803.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/15987842747.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/83313331116.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210820_071913.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/11610761635.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/lasapag.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/ef667006f9cddb7121b5308bb2920c94/farabisinewadixemifab.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/e5l9fnbs4d6n5n9pdkn01gfrce/93600708861.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/zusekuwatezowisamip.pdfIn PDF document text
    • http://rilta.net/userfiles/files/parofilu.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/84632230833.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/75553778482.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5b855ff14---45754603142.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/26748933989.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608011d37f4bd---xunisa.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/99511229082.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_off0000d68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68F 17220 bytes
SHA-256: 4b8d0c0599ef24bbc2416c9f41251de87315874d8b6d3a8c8ea0772bb8f0727d
font_01_sfnt_off00010317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10317 11436 bytes
SHA-256: 9fb4cf89346325fef8a0abb0e5ed801e54db6221e4f86207f8f4c82b681c7b8b
font_02_sfnt_off00011dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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