Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc9621d06345b23…

MALICIOUS

PDF

81.7 KB Created: 2021-09-13 22:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 63f0fb4e47e8ffc1e8875068f72ec82d SHA-1: ae0cd5d073c2222596b553d837a8db60bbb60003 SHA-256: 5dc9621d06345b2322b85dadfc8d6ad5bc775e47cd22b7ee3b5894bb12f48458
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document contains a link farm pointing to compromised WordPress sites and disposable domains, designed to trick users into downloading further malicious content. The presence of embedded URLs and the nature of the heuristics suggest an attempt to deliver a secondary payload, likely through a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=transfer+files+wirelessly+from+android+to+mac PDF link annotation
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/vivejagi.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/bereto.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/15154899775.pdfIn PDF document text
    • https://pvcmikser.com/upload/files/duvenikibosopax.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/tidokasa.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/75257197491.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/dojudugop.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/52116071724.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210909023735.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebaf2e396e---konuxidadefusafunozon.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/raluwigiwit.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/501101_93120973725.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/25778501577.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/surokijekizesasas.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/08997af5b2dc81197d58ce452f580d24/zozezabi.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/sajus.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135440ed59e0---97392448797.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/kosebus.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/152d6d3f7f67f657f4a9aea037fe6882/boxebuwulexuserapabax.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/17960229780.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/74928746689.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/goliwivipiw.pdfIn PDF document text
    • http://maidichike.com/upload/files/bekemuguzefu.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/rakumiw.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/93380062036.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_off0000db0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0A 10800 bytes
SHA-256: 824f13395b32b5e972121ecffdb86e3ed6297e93c2f8431be2fc25eeb512ed91
font_01_sfnt_off0000f402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF402 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C14 17440 bytes
SHA-256: 139b4ce0d0b4211b825b500067799c69e5ed91dbaeb6d625b92e4eea78034e04

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