Malicious PDF — malware analysis report

Static analysis result for SHA-256 c82c01acfee92c31…

MALICIOUS

PDF

102.2 KB Created: 2021-09-06 16:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e9f5c2f1cb99ffd2c853a394fe870c2f SHA-1: 5216dd3399fa0a0ea03ef153a8014e498ea32a68 SHA-256: c82c01acfee92c311474a5d5e14c35c68f40e70d6cd137c99089175ef01cb380
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The PDF structure itself appears to be a lure, possibly exploiting a vulnerability or leading to a phishing page.

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 http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612a517c392fe---53776653422.pdf In PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9abde3ca22---safexuvemiduvewanolez.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/2jt43ms5ek23v30tumih6siqk4/pujopisojemidowis.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efea80b31a4---33956217580.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe4284cc87---51912804136.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/65rt6q7sj4ani4hk9976nnpb73/jotub.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/52047363470.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/gebojup.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/serewafededov.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/8bf717a0fc88cd8e870ce7f480e9a56a/68609757213.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/l9tah0lfn2al9tveohnc5j9cbp/18497772102.pdfIn PDF document text
    • http://markone-tools.com/upload/files/rofelekovevifaxegujes.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/8935c5e0995934c53ac79268b9083803/nitotojibisiziwivikelub.pdfIn PDF document text
    • https://fl-forever.com/upfiles/editor/files/modikogamafutotokilub.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/fumopaxigirugibosalafumod.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/61994869870.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/giwomazutaxilesimaradaji.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/parozedexej.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/vusenipiwolonodiga.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/b8c2c62225ffff604a0e129c715e7894/refopolatevola.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1608b822c85351---nakevomoxuvaluravov.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/niwataka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=master%27s+handbook+on+ship%27s+business+pdfPDF 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://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_off00012c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14473 10908 bytes
SHA-256: 269502ef5d32eaa48b399f6f48805e9523a3757104145692bd8374abc4e1168a
font_02_sfnt_off00015d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D71 17472 bytes
SHA-256: 46def774d3f027fed8849ac9f254e52ecc094a18c535fc98589ded2500862aa5

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