Malicious PDF — malware analysis report

Static analysis result for SHA-256 6488df6e9f85837c…

MALICIOUS

PDF

85.3 KB Created: 2021-07-19 00:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6e1aaf176bcaee6bc84fc217eb21f293 SHA-1: bc69ce2194713c5b8e43ca630561b7a5dbddd72d SHA-256: 6488df6e9f85837c2e48892e908aacaa3c13b32c28916e050e9dbe37f341f779
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.indoorclub-informa.com/boletines/img/file/65044558394.pdf In PDF document text
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/28603899699.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/puzositovexu.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/tifipu.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021060933218_989475101.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/43850101426.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/4eabe6f8dc88cf5acbbc7ef810f1ff9f/42182620724.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/narakagu.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/japagudo.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/72702061437.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/wemaxe.pdfIn PDF document text
    • http://sunnysideclassof64.com/clients/a/ac/acc4ccb49d7935ca36198347b895393e/File/vaxosozolud.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16088d9a67351c---29447465768.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f30e96efe6a---93330491087.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/66847415534.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/b1de5bd33cf13389062aba39704342e6/vojazumekuxadiwapemit.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608782f419acb---7434305493.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/55485076700.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/29731813684.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/6083719975.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609411449a088---48449947606.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/86105947068.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32e1ab9c7a---borikemilet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=kinds+of+cuts+in+culinaryPDF 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_off0000eb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2C 16712 bytes
SHA-256: c7d78e6d2346ea5cdddc611fa5891b0a2aa9a4e30e9c8ad5554f1ed2f0e8946b
font_01_sfnt_off000116a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB9 10544 bytes
SHA-256: d3080661166f764df523f62e39cfcf5c3eee64775e762cb03462589d13a2cabe

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