Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e33c76d384a5403…

MALICIOUS

PDF

74.4 KB Created: 2021-07-30 07:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4c11a90ebc3d7b712f54774fa12029ef SHA-1: 1cb4af80029b51d563fcc00c8dcf90179096a991 SHA-256: 2e33c76d384a5403c13662fa1c038cb978d667e90886a724e24efdea32edeb53
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites and other disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous external links are consistent with a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://flardochform.se/userfiles/file/61862916631.pdf In PDF document text
    • http://metrocars.london/survey/userfiles/files/damov.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d84c9ed169---zozadafel.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/rijize.pdfIn PDF document text
    • http://ronniejoymemorialfund.com/clients/1/1a/1a75100f29d804137a154ca93ef51a80/File/dijozipobupu.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d41294bc5b---18688668730.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608255004bd0d---kifumibitujukasulebus.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948a837151a---55102899267.pdfIn PDF document text
    • http://lg-palette.com/upload/files/kiladodikotifon.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609811aee4d16---15118473757.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c058522d90e---pesapemar.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/xezenosolesotebune.pdfIn PDF document text
    • http://wilkinsconnection.com/clients/9/94/94ba1e7d864c5c8af3bb481f5f9f31de/File/54076946667.pdfIn PDF document text
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/kubalebezajugesolimuv.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/5543214498.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42ebc380a7---81779518834.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/84170085930.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/ir6amqshbi2bv05ahj6fvu4nnj/gaduvixo.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/12476245510.pdfIn PDF document text
    • http://unsersohn.ch/images/file/78313810312.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/wananoxeg.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/neluvodonuko.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/susonebibozide.pdfIn PDF document text
    • https://cafe-malaysia.com/contents/file/12061369416.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5e99ebd3f---vorajewodazarivupaka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=space+drawing+perspective+dongho+kim+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_off0000c017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC017 16320 bytes
SHA-256: 7113427ce6093080b585d4457c1648f3066adfb5ce241cf6a15333f8efc857c3
font_01_sfnt_off0000e95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95D 11340 bytes
SHA-256: 5da9233d0272f50cfb3e508b4986229af3869d309fd39cc930cb6c080c6ff720
font_02_sfnt_off000103b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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