Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b3d6f85d30b1d77…

MALICIOUS

PDF

87.4 KB Created: 2021-07-25 01:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1ec6bf9db564e8e65465f89fbbf17d06 SHA-1: 034731e1532b3a33cea0c3e7b884e9b72b8cd4b6 SHA-256: 6b3d6f85d30b1d7788cf2db1fec54338802e7dde31d06de976b430613864be37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm, directing users to numerous distinct domains, many of which are hosted on compromised CMS platforms or disposable hosting. The embedded URLs suggest a phishing or malware distribution scheme, potentially related to software activation codes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://50wj66.com/clients/a/af/af9d65f11c1965a5434adcd4cd578f00/File/kewirixomolada.pdf In PDF document text
    • http://praguetransfer.com/files/file/3778183623.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/06/20/79244834464.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/guxini.pdfIn PDF document text
    • https://bczenekar.hu/files/file/moxuf.pdfIn PDF document text
    • https://actorconseil.com/files/file/zexemaporoxoleni.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdf135cabf---21277537663.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/38658454092.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dddb93e1e36---xakovazesapuk.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/0b613f8090767dcfe968df57acfad4c9/nolenuvosuw.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093f9909c518---fodawetorupat.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/takariwegozujak.pdfIn PDF document text
    • http://sweden2020reunion.com/clients/e/e2/e2375cbe45a1e08e95d3a39ca41e84e3/File/bujemotatu.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/ziludalo.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/kulegojopatemuzore.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609304142aa0c---tofiloweniwojezex.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/63187774155.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/18428975023.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efd1b83e4f---kufosisinivipopa.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/ca6a33887f6177f30f2aeac6858b3cd9/50212449523.pdfIn PDF document text
    • http://schooldistrictservices.com/clients/f/f6/f6ab1571d2cdf5e569af7b76e288b17c/File/gifedifivedudesatidive.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/25045385982.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbe0917f96---xaxibexemuzarurewiluneze.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/28778495462.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/31658000906.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=avast+internet+security+activation+code+license+key+till+2050PDF 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_off0000ee9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9F 11092 bytes
SHA-256: e351fe404cdabbfbebcf7c70c56473518a4a24b37c66de14317c15b19185aea9
font_01_sfnt_off000108c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C5 17400 bytes
SHA-256: 1e6f21ee0c48ef022dfe302ef14e625a8d90f754ffcb784cb339b9db59bbe82e
font_02_sfnt_off0001367b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1367B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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