Malicious PDF — malware analysis report

Static analysis result for SHA-256 e236967a39be998d…

MALICIOUS

PDF

86.2 KB Created: 2021-06-26 16:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 251e5e9e938ca0ac02078a26aed6ee7c SHA-1: 3783d70c4683fcd639b0bfd23bf5d007a7b5a24c SHA-256: e236967a39be998da1a54cb6a82c5919165765c01f0dbae5d3c756d844b9cd62
164 Risk Score

Malware Insights

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

The PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload storage, suggesting it's used to distribute further malicious content or phish users. The presence of multiple links on disposable hosting and the use of UTM parameters further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/9869eaec75a185f648dc2f62de62cff4/simoxoritozukutomut.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608024c8dbf4b---92885822600.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081cdffbe113---93868208547.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b63a56a37---joleridafegibawawerew.pdf
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/diwuf.pdf
    • http://barcelonasixtytwo.com/userfiles/file/11369077250.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/0468672d5caa4301d060cb9b1f6d22a2/rulipetewelawijakamajepov.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/cd09da3570e0d42936a3fd9a821a0a63/ditadogefobugawenof.pdf
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/19c9969b683ea3e1ac49477daa38925e/26948040636.pdf
    • http://diplomat2014.ru/ckfinder/userfiles/files/pamerafirez.pdf
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/semekotakanejo.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4b08c8bfa---xatevavu.pdf
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/9r0stg1g5s21jn70f70ul3oip5/61896724373.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffa17a59b3---25754393455.pdf
    • http://slsnn.ru/content/file/xugejusa.pdf
    • http://ampletrekking.com/userfiles/file/41113213987.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce066b55fb2---nagagegud.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16090499f90d2d---gadomejirarobuvi.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/80388058c7563e65bac002d8679cd19a/66660746104.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/375d500ada148f5dab22f481afb42de0/tizuzubajefej.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/qds85881st0ttin69frjjv690h/sovabebonipoguwijodawesat.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/7c99ae4f67cb1ee8ed6b4c5a526abc2c/75163940658.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ne9bstsibtfcdvj54q44hsfsii/piwekejarob.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=gesture+meaning+in+tagalog
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed91.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED91 16792 bytes
font_01_sfnt_off000105a8.bin
24100819903d30b27bf8c56c06361b791003a173df1d87ecbb74d584801dcff9
pdf-font-stream PDF embedded font (sfnt) at offset 0x105A8 10588 bytes
font_02_sfnt_off00011dd8.bin
6a5838ff32dc5431a551d8010e167f0995ff061eef32d3cc0243ad435c82449f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD8 17628 bytes