Malicious PDF — malware analysis report

Static analysis result for SHA-256 d789c23edaaa6161…

MALICIOUS

PDF

69.7 KB Created: 2021-09-05 14:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9d6cf34076783097563092347d407c5d SHA-1: 34dd0f3c8b86901c4ed8b19efa5946f4886e91b8 SHA-256: d789c23edaaa61611081ffab5aec2f8de9a9a86a2a12f997f6cb5bd2cdd75f3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, disguised as a prize bond draw notification. The presence of multiple external URIs suggests an attempt to redirect the user to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://pingthye.com/userfiles/files/36235062443.pdf In PDF document text
    • http://www.radanhorse.com/resource/files/guvakavojepozikorimo.pdfIn PDF document text
    • http://olympusflights.com/files/files/tuxijagamanapibe.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/p8ifong7qtboapoijco7qdn5nn/40470669128.pdfIn PDF document text
    • https://aquatim.ro/uploads/files/90875693883.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16106442921820---20252706439.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/nm3a78uj9l0alp94es83nh0kee/kopogaraxax.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/8908eb475c28cfa6829c9a8f988d9400/jutejarowameferove.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/57319389970.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed6181ea10---leseponanaxixuxipub.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd76f2ef579---18573730331.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/50377919523.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/310222a0371c36384ee6c63b4535a35d/tojirisomozofejuxi.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/94888899606.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/35112598650.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/0sbjp1gu0smkue3aci45tc5tdp/vuvimaze.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/5302395743.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/7cd18da24bd0ea15144bb424832b4b5a/56589174797.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d85a91eb70---22849266701.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/0d38e4aaed450c70dedfb4eda48a220d/foxabitewozenuju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=prize+bond+draw+pdfPDF 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_off0000b0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E9 16320 bytes
SHA-256: d6323032939d7fcd154b593318b01e0e83593defdcd06c11db5929c1b12701ea
font_01_sfnt_off0000da35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA35 10464 bytes
SHA-256: 326e1c1e6d8503cb8943aeebbd4f34417603f81741bce0a7a3da4ce981c1c6f0
font_02_sfnt_off0000f1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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