Malicious PDF — malware analysis report

Static analysis result for SHA-256 844c8778a7608cfc…

MALICIOUS

PDF

100.2 KB Created: 2021-09-17 16:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 504598273ceb1bed6e9e62c8ed5e896d SHA-1: 7503d4d1e7eeb19ffe2977524ed919492ea81dd3 SHA-256: 844c8778a7608cfc63a0dcfc56749c758f46bfab9d424af04b24ad421b5e9c0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and a high number of distinct hosts further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://doina.md/fckeditorfiles/file/gurawoj.pdf In PDF document text
    • http://sity-luxe.ru/userfiles/file/85360324112.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/nagevefetepilanuluzelibi.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/67917604132.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/9773d6fdce3e5fcd1d97990ab66f9e4a/96827541980.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/89548703805.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/zukiwezipa.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/sekusagosenunuwadoj.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/87296816344.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/71910958466.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/tifapebikopuvub.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/68689606586.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/30773665868.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/b337605b2c515b26a3a595f3d8229e5f/labanixojiwitupuworeril.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/sesis.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/fovaniwimafakiran.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/kvgs7vg6e1v52br9nj6kksae32/meralisedilefibu.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/sorunoj.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/xixurato.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/84210450244.pdfIn PDF document text
    • https://razredna-nastava.net/files/tawik.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/vilup.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142330678dbc---11008303918.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/34267603269.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/59042243952.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=high+and+low+final+mission+full+movie+eng+subPDF 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_off00011ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF6 19360 bytes
SHA-256: 41948ba61e8eb2c9ad38411235543718dd12476e0a90d37d1c1bdd9e0687ca45
font_01_sfnt_off000151df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000169f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169F6 10984 bytes
SHA-256: 509bc5b06601bb15cd59de01fb1698c2a8c619ddc521824382a3bfee8400a582

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