Malicious PDF — malware analysis report

Static analysis result for SHA-256 409d89a123319956…

MALICIOUS

PDF

81.5 KB Created: 2021-06-18 16:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 8e83b9ee038733f95d4c712075551c1b SHA-1: 936829b5ac6322a01a6f8962bfbee9d0c120ff9f SHA-256: 409d89a123319956c5c8df49081a999aab44118d35381d2e0b4b9aca10ca87ad
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous links to external sites, many hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious content or download further malware. The document body, though heavily obfuscated, appears to be a lure related to gaming content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mzr-avocats.com/buddha/ckfinder/userfiles/files/goderezipo.pdf In PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d9fc025a9---wanatojigejavutefodiseba.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/26959106053.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf6f69a685---vuriwolumivibuga.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/fc832208e6bf1268bc37dd1118d010ac/punuxuwezu.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/venubenuk.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607516db8ff2a---rovunurezexij.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/bfgph2kf5ton1rc1odqjatd69k/26847996034.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160783269bd39e---16934602856.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4337cc55a2---bafemugarazojiz.pdfIn PDF document text
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/77853207181.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/53537704976.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/lonamodisezaguruwebi.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/75aed2c631f152d7e7cb6fcce5d32a09/fidojolojebamuk.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/f823e3a2dfe3f46ae1d365b04d77083b/ruvenaxowuvapikib.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b153c6f474---bewane.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+spawn+herobrine+with+command+block+no+modsPDF 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://scripts.sil.org/OFLIn 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_off0000e583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE583 5572 bytes
SHA-256: 4f6656a6dc51f6123ef6dc6469bfa5c0885eef25a82ef538b738233936e1ca61
font_01_sfnt_off0000f84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84D 13036 bytes
SHA-256: ca790dcee653436c8446653d39ad0aef647fa44a8ac1a279d35b10b30e1103a2
font_02_sfnt_off00012301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12301 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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