Malicious PDF — malware analysis report

Static analysis result for SHA-256 37bb970ec7a2b3ab…

MALICIOUS

PDF

114.5 KB Created: 2021-06-23 00:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: e1179cbc119d5afe42fc1ed77816fbbb SHA-1: ae7c734dd5a617af455a5b7288cd2197007795dc SHA-256: 37bb970ec7a2b3abdfdf4a292453b01da430d4b57f4eb3d6994b5bcc28d3cc2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF that contains numerous links to external resources, many of which are hosted on compromised WordPress sites using the 'formcraft' plugin. The document body, though heavily obfuscated, contains references to 'Cobit 4.1 pdf download', suggesting a lure for users seeking this specific content. The presence of multiple links to potentially malicious PDFs and the ML classifier's high confidence score indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c78a0161c49---38948625444.pdf In PDF document text
    • http://bluecars.pl/userfiles/file/91038113435.pdfIn PDF document text
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/87261305660.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5e40b78bb---67802000429.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce5a045544---mokekal.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/sudesixumagodij.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/60025393215.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7293354ef5---goxenugodowawufo.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/xesokofa.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc0e73d02f---pevesuxubutarero.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/24aaeeea6ad7a5f49ed081721fec74a3/66808830230.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/c7bgavqpfpu60cmb76hdonrhl2/63841354881.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/91488266303.pdfIn PDF document text
    • http://deauville.ru/files/file/99409756696.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16072aa7f497b6---gisokodarilozagadokigufil.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/mosewig.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16082063ca773d---belevemunuzajunevikil.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/nevajarorep.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/42906793397.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=cobit+4.1+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18753 5068 bytes
SHA-256: a4bb568a3dae6b0d5e503185048b1cf4a448ee3db796b733ba21c4abbc89c60b
font_01_sfnt_off000198c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198C6 10592 bytes
SHA-256: e30573f8f5fded84518c60d5fb8f5e2f279c261f63760660e99cf39092a5df57