Malicious PDF — malware analysis report

Static analysis result for SHA-256 10b19f04385d73f8…

MALICIOUS

PDF

75.3 KB Created: 2021-07-04 07:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0715e7acfb976c6c3488aceeb357f124 SHA-1: 1b2f021479ba138a628c7f05fa1585f7af287778 SHA-256: 10b19f04385d73f89f7e38109206111b2e3543163dcfa928aeaf87941e315f0e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or phishing pages. No scripts were extracted, and the document body was unreadable binary data, suggesting the malicious functionality is primarily driven by the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dbac53fbcc---48042731657.pdf In PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d35c51b9bf---rorikugo.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/rizokugedizupajuwefidimi.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094a6834c4c4---tulisuwikosu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/molusarugotenotudekixot.pdfIn PDF document text
    • http://delshadian.com/public/userfiles/file/zofamaluritag.pdfIn PDF document text
    • https://diphong.com/uploads/ninopabematiruwokitabuva.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8d06gq7b55kunav3femqrp6676/jodilaligulu.pdfIn PDF document text
    • https://liderpin.com/calisma2/files/uploads/pulose.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/p7s7bo7p8kvc8f4mom5gbnjap6/95059678096.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4a22a5efb---54386315339.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16082d08ea0c2b---mojatuwazitasekutixomo.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf604a3ce7---93733509706.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/luvorik.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b14f3edf617---potapukilufuzivepibal.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/1124dce1cfbd2ab9d42161eb3733785f/pimugemu.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/f84104e042873c4af43e9c930109b8d7/19189847853.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160baa2e04e1d4---76189675102.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6f923c48b---radakerixugidagirikokenun.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/turisazonologajuj.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/7b51f7f0db6d201cb5a6a1f3070b624a/87259661284.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/4bff268a86da5b2c045547e2333687e8/12855112535.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/gurefepe.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/p7ukvqf74p85mlv1h3qh3k989a/68339266483.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/9bd75911ed9de2491fbb53f12dc70b6b/sofuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=cullman+community+shoppers+guidePDF 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_off0000c1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E6 11208 bytes
SHA-256: 61a78dcea34ccfa98c2738b7931fa999be5091f57756749c747a1068fc6f603f
font_02_sfnt_off0000f3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C3 16928 bytes
SHA-256: 3cd73193784fcec0f1c698ca093f9dd5fa614017fb014da8b9d804b8336a4327

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