Malicious PDF — malware analysis report

Static analysis result for SHA-256 45c04bc544069131…

MALICIOUS

PDF

64.0 KB Created: 2021-05-12 07:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8957057c700a22c22f9947c43f9cbf7e SHA-1: 2225f057f1163dc3b7391aea7a130e94eb1403f3 SHA-256: 45c04bc544069131e5552ac48bb02f7b28c37b5207e3fa07b4b2f465367327a9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to distribute malware or phish users. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier further support its malicious nature. The document body text, though obfuscated, contains keywords related to factoring worksheets, likely serving as a lure to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8518

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://drafthe.ru/uplcv?utm_term=factoring+trinomials+worksheet+answer
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/84175206b0a1a807e6a6febcc946732e/nozaxupumorariga.pdf
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/ef3b1dfb75134c57cfc901ded751b15b/poroworunumiko.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bb6fdfbac6297075bd6d116770732cd6/51060877914.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3c4ac661b---84488454040.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/eca78c6c97390825db67a0023d0e55c7/zinapavifepiveluvubovezux.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608204de7e515---55894254411.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16075780162bdc---26690962814.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/4vl7ua5s067ddq1ltl7covok10/58928428662.pdf
    • https://sportsht.com/userfiles/file/36232903926.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076982f81d5e---23352433322.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160747a73a826f---remurogefimogirikevolon.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160941572000ed---robukirelezumerur.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609192aa3bd85---jajivurumub.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071af6be0aef---96242181043.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/3a7f527c1ba796bba5ca90c1c3c675f6/15664816650.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce6a.bin
d558ee078a3bd0e4c482548a870d212adfed64be95f1b0ad374b6184baa0081f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6A 5324 bytes
font_01_sfnt_off0000e06e.bin
ec1e39f9661e411c84c227aaaab2bee83e18e806b8837e3e9539bdc5699c616c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE06E 10268 bytes

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