Malicious PDF — malware analysis report

Static analysis result for SHA-256 79bf0cac121f37d8…

MALICIOUS

PDF

104.7 KB Created: 2021-09-04 09:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 38e8529ebabc1c7d64160d3f0ba999ab SHA-1: 1e79ec03625a50fefa2aadc9537746c77e14085a SHA-256: 79bf0cac121f37d8dd90d0194fbb66f9f1a8bca23a871bd2f1c49fcea7a48c80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to other PDF files hosted on compromised websites, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a malicious document designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://thai-airpark.com/ckfinder/userfiles/files/57825168916.pdf In PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/wuvomerawapezavezi.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/vosaxisurezanibifeke.pdfIn PDF document text
    • http://pitneyclan.com/clients/c/c7/c7afcfad87c307b096642b2e35f52d25/File/78813155350.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/463ed76a9f4baf8d9daab1befb1ff0e9/sonozakidepifiwame.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/cc1f0cnodojolls6m54b1mhmpn/71301707491.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/ibtaeflferqqtbheijeomt6tjb/miwoxigomurezu.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/qbifhc5evlmkaebta4dkot7ir2/30866649981.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf1f564969---42921137848.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210803_190314.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/bf8f50a772152bf9007e2a332304b08d/paboromojulijakibe.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a5da7ada72---boxufasawekagiserew.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/97046197940.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/jcpop8l4k1kemuh5tfe5ev1csk/jugujumepebasuvedeb.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/82922493676.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/35594793003.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/nebitav.pdfIn PDF document text
    • http://foxadv.net/file/fukerepegodebikewo.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1c917d13f---tusikigisixitowirevetajup.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081141a0fda0---14385043378.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/kenafe.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c67daa98f7a---powefisajesufej.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/7998767413.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf3b1dd45ce---bagawekojevoli.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160757e6e59c58---pigis.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094d16c62642---mepamakujuluwaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=reverse+chain+rule+worksheetPDF 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_off00013214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13214 19124 bytes
SHA-256: fa65a90a4338bfabd1760f9a308178f490db2fa5091d03ff1de3c8468bccb544
font_01_sfnt_off000163f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163F3 10716 bytes
SHA-256: f8c075748e0e75f1917acec47be92b1aa9eb7b07b0a9e6792576c933c49547a1
font_02_sfnt_off00017ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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