Malicious PDF — malware analysis report

Static analysis result for SHA-256 50bde6c47a2829f9…

MALICIOUS

PDF

78.1 KB Created: 2021-09-17 01:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: af5c194182afcf7debd055b65a1446a4 SHA-1: ed724a9e7a85e161be050755d32d64da18c54de7 SHA-256: 50bde6c47a2829f979952d35ec120b89118ae7e8236df91e694dcee5dbf92649
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of external URI heuristics and compromised CMS upload links further supports the attack pattern of luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://irlanc.ru/uplcv?utm_term=any+quadratic+equation+can+be+solved+by+completing+the+square PDF link annotation
    • http://www.moyekolodin.com/files/muxodedasetizivasibipese.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/43069828477.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/161314a94a0dbb---zuwizasolefujasedijexopu.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/45384142986.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/tupujufegivalonifeselil.pdfIn PDF document text
    • http://hflchw.com/upload/file/xololimedopubaga.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/jasabexegoxuvasega.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/sozokiwuzitetawukefada.pdfIn PDF document text
    • http://hbaoge.com/upload/files/kokaxuzi.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/72156728946.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/24968106725.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/14699388885.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/bumobiki.pdfIn PDF document text
    • http://tencanpowder.com/d/files/63632544893.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/loxidatijozilu.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47373273405.pdfIn PDF document text
    • http://1carl.com/userfiles/file/1246273661.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/485bd52ffaee8be2f6b5aad0394e362f/walezog.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/f04f9e7b2c6ededb4bc5903892426d24/vedufotojeduzuvab.pdfIn PDF document text
    • https://guijek.com/userfiles/file/sewisemajugariwudatope.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613360504c173---1716833089.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161313d1611f1f---48506992548.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/40530071014.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/gojigajetuxekasesirawege.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_off0000cbe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE2 11508 bytes
SHA-256: 27b67671b19482862af068faf3d56dfe33ddac69e3e13946df3a6e290f34c7ac
font_01_sfnt_off0000e646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE646 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE58 16776 bytes
SHA-256: d9158284daa0f5653ce006e2cc621f37147fcea91bcbb27ad1496fd8acac5f0f

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