Malicious PDF — malware analysis report

Static analysis result for SHA-256 628043b5fd163e55…

MALICIOUS

PDF

81.2 KB Created: 2021-09-03 19:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0f5b39bfdc6f140bc166d90623484453 SHA-1: ddfb4a58c117e254e1c9d7211589fc2d126ad353 SHA-256: 628043b5fd163e553e5ccd291277739c0bd2a8196328ed334aa9f2648661fc6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://living-stone.lu/userfiles/files/padesigukig.pdf In PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607baf208a8a5---jokodogulorugol.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/vebejabipozuvapiv.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/mebiviz.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608429602f54e---60387240516.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/pavijak.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/9d904b8975207487ea2a741ce7de5968/gazupiva.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077afadb48c0---68024673253.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/ridixarugomop.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/8750c631d4d721087211dd3d5a591e81/78248651544.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/zegej.pdfIn PDF document text
    • http://skikk.eu/app/webroot/files/userfiles/files/galijogexakon.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/vexegan.pdfIn PDF document text
    • http://palami.by/images/file/49805043365.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/5433961578.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/68205212352.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/87821272a062f4e653a239c1cc79c7e8/zomikurumumok.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/180777b7cd5b7a0f55467b9de8b87465/todinas.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/12166851366.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/dejofuzegaxazajezekatebom.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/36404720474.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/tetosep.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/xunevo.pdfIn PDF document text
    • http://misspacificus.com/clients/873634/File/23235018244.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=vishnu+sahasranamam+in+english+pdf+free+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://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_off0000d12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12A 20284 bytes
SHA-256: 689171c0d5606f0159226d3c3b7cd1e6bfe56972375e619ae152eefee8d0141b
font_01_sfnt_off00010596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10596 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAD 11000 bytes
SHA-256: 1e709ea15fe488dcf51f7c7a34a1c03b3c97047efe5cddbfb999d8483ca0d875