Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ece578d9b0c91c6…

MALICIOUS

PDF

95.8 KB Created: 2021-06-21 08:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: e6c62c0cc0eda29ba4e20173c24bcfef SHA-1: 7ae6e79ac7ca343f6c486dbfe0f8a614462175f3 SHA-256: 5ece578d9b0c91c6eb4b8948a7d57d55df2eae494e57e59518ee4eea8a3fb8cb
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f17533135f---97561080143.pdf In PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160cf3f256adc8---25765906992.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/30571862848.pdfIn PDF document text
    • https://irrisyst.eu/files/file/geburosetimulewakawi.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/i9o88qpdiea8sqnqtf6t56eed7/wonapalixizonukun.pdfIn PDF document text
    • http://transinfosoft.com/userfiles/file/64543007185.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b6abc1f40---7457716347.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/xobugekojojel.pdfIn PDF document text
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/30576877652.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608713c34d84b---98768096419.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/makezojinavejerinalaj.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/15182886798.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1184c837e---kadifebezakoxasitil.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/31ee2e8a6ef8c23e44b7fd75db21c6c2/63508011983.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=brutal+death+metal+mp3+downloadPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12372 5324 bytes
SHA-256: 5e1b60eeea886d03f02ee89f047726dc1c2f184a67b7a2e2e42253152b58eb8b
font_01_sfnt_off0001356c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1356C 4092 bytes
SHA-256: 3d77f0cf32a89f711f7817fcbbe4a01f495d5ae810a8e83db12cc1e9a8b3e710
font_02_sfnt_off000144df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144DF 14276 bytes
SHA-256: 036886754ece38f256058f4d8e805de9d5f6e637c0586ccb273aaace8dd1e6af

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