Malicious PDF — malware analysis report

Static analysis result for SHA-256 6521efec9139d0f9…

MALICIOUS

PDF

86.1 KB Created: 2021-07-17 03:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 14e9cf973ae6c63199ee3e167f67cd27 SHA-1: 2a2bad7a83ea513177b8ab28e34d3764e9f2dbc1 SHA-256: 6521efec9139d0f9e41917d207c7aa2c0acb47fe2bbd2b13514df59815542cd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used to redirect users to potentially malicious sites, possibly as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160982c2b3a1c5---karuxekate.pdf In PDF document text
    • http://anvlaw.com/userfiles/file/63700032979.pdfIn PDF document text
    • https://tl-systems.hu/files/files/1386201804.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e018b9c6105---tubazub.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/77609586975.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609710875eba1---97590355101.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6d9f39350---pibuka.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/n8a5u42ie2fidk1cl02935utt4/gofer.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/4d1cefd6b09f34749f9b9e5f75f192b9/dakix.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/820a611d6676dc538e7be71e520a3480/32197279148.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/30008785308.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899ba45ec2e---ranomemotod.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/743941e28478799b4c21efd55c9cd5ef/71889688780.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/44099146665.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/zumojoxatinejofadeweruxe.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781719bed8f---miporokufotupevigakagu.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/101f72b4287dcec267ddede2392e0f2d/devopapanobibisogikaz.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16078391a8dd10---81647446042.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/papokisi.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/rujisojerenew.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8b6ebc3d9---62688686638.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0741a24e8c---wekirajowe.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/gjoaddhf6pbn8l6t87oifo07vd/6211998452.pdfIn PDF document text
    • http://valeneighbors.com/userimages/wowobilive.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/97309888139.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/73503117dd3cf06b3b96ecb849f8507a/68401792952.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=welding+and+brazing+near+mePDF 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_off0000eed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED0 17208 bytes
SHA-256: 62b8c9104f7c48f7476d7235ebc9ffd23f878cc1e9c90989789ad55fe5c3350d
font_01_sfnt_off00011bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD0 10400 bytes
SHA-256: ad9dceeaba43214d134a49c5e8e508ce82ecfb4cfdc735a1c6312ee496f25f90
font_02_sfnt_off0001330c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1330C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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