Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a4931383fc4ee91…

MALICIOUS

PDF

88.2 KB Created: 2021-07-03 16:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0f18a9882bbe6762fee56561b33a3f5d SHA-1: 6c4e6e3eb0b0e7b700a12929c44a1a23313ea9fc SHA-256: 6a4931383fc4ee9129ca896be9c0165dddad36408377046fa6b76b0bd7efd7d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the 'super-forms' plugin for file uploads. This suggests the PDF is designed as a link farm to distribute malicious content or phish users. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/rcpjs3bbtg9gc25sq3202l3vof/5914413817.pdf In PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/vim7h8mgri3i4bbu9dk7akrmt3/rijami.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/jijowazigipaviwolelamit.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/e67b95dcc82f59050d7a073424be1c9f/11181046867.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16082ffe09c3fb---30000766315.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/84659102869.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/83316375941.pdfIn PDF document text
    • http://e-hane.com/files/sogizuf.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/9d9597dceb5148821c57b18edd22600b/zotewegelagepabuvab.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/96265765650.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/20347119413.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c6ed47615---dipivazij.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210611212214_edi643.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/7953101478.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/17aa34ff2a47347493036c104ff31ee4/getarin.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/pufitemiwirobuwef.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1257483da---47607353174.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/80777950262.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7c38cd466---rawovogovenisap.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce3eba8d87---38872243606.pdfIn PDF document text
    • https://digireg.nz/upload/29820110436.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=scaly+sole+of+footPDF 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_off0000f356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF356 10224 bytes
SHA-256: 213a696d2ccb9beae7ced2f43c9e90e887e8225f4fb506c88ebb7ca214a98a60
font_01_sfnt_off00010a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7B 18824 bytes
SHA-256: 5b1e0a773b4f08f85560b9fe5b45996928acead537cf1c14e4a179d9793669b7
font_02_sfnt_off00013a92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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