Malicious PDF — malware analysis report

Static analysis result for SHA-256 15e256f4fe62a2ad…

MALICIOUS

PDF

72.4 KB Created: 2021-09-06 21:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2721d7abb30268ffc7853ed062bb1b25 SHA-1: be2b82d745d0bdaa39164bd67631773030da9c03 SHA-256: 15e256f4fe62a2ad4d5663c5a9e39e10689f99b3c249d2b1c583e497075cc82f
172 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and presents a visual download button, suggesting it aims to trick the user into downloading a secondary payload. The presence of multiple links to potentially compromised or disposable hosting sites further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210623020613832458enfd9b.pdf In PDF document text
    • http://hainescentreasia.com/images/file/23763309224.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/bamaxudoparokalavapu.pdfIn PDF document text
    • http://mtprospectbaptist.org/clients/7/74/74f10a8404da00fab064704771972c19/File/72245675380.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/gerekob.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/posiwidorumivil.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/pujuduguxutuzosakosa.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/28761752784.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/91322189644.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/qp3ibs501lq30umpu48qv0n91f/rodutamixirez.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/pesamaguxo.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/cc6895cd4ce792a1762cf99c97766275/48474735894.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/52031397906.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a9c263b9b---58169423828.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/mitutuxago.pdfIn PDF document text
    • http://esejsc.com/upload/files/16280176812.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/jeson.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/dodunafa.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/funaloxepaduvemujoxosit.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/dobusifisodep.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-07-28/images/files/69570126775.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/zorena.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6afeb3f8b6eef10f326f818c0d2cc297/wamul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=jlpt+n4+pdf+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://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_off0000b53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB53A 10152 bytes
SHA-256: cfac9f578f9f9a7360e61677f011c436faf2537ff5a12a774d6dd5dd82f4f969
font_01_sfnt_off0000cc28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43A 18552 bytes
SHA-256: 02f276a33f051548b760443a6d44a1b6122f23b5ed9c9ac0f9a5d45da1f5b822

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