Malicious PDF — malware analysis report

Static analysis result for SHA-256 607021f8a272a953…

MALICIOUS

PDF

92.2 KB Created: 2021-09-16 00:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aa412363d0d74f3cdf236ebeffa9e63c SHA-1: c59e0a61e23a0e899adf38f88cd9458cc288a840 SHA-256: 607021f8a272a95392c5b9b5baf6422b57967006b9f3dc82a7b9f9773547f21d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The presence of JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=after+full+movie+2019+link PDF link annotation
    • https://jjpremiers.com/files/98439445387.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/noximezerob.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/pofenilew.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/budaxup.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/202191652364647.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/041738152894.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/58191517532.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/pexemegoxebiritobijunida.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/folasakez.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/55600977886.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/lunuvesodepotuv.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109130524022973.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/51657953950.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/jeradasu.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/74455537726.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387f72163a3---32805875602.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/a09a9e1bdc04a761cf454d30e3e293bc/nosunigikek.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/gogubiketolezanij.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/70986084961.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/29583989055.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/saguwutufisumexalegemuk.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/sajifozada.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/e79e4b426e2cb6f87d4220ca6c5f2888/94554818027.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/sipazamemaferubaviduk.pdfIn PDF document text
    • 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_off0001050f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050F 17288 bytes
SHA-256: d81de201de54a52883519c176fcadfbdfed0037ed44f9ebd956d1fde053533e5
font_01_sfnt_off000131f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A0C 10744 bytes
SHA-256: 16e2b0ddc93abddbb984463cd522f54786da115dd3841c580669049c09314c98

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