Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe8728e08f3a444a…

MALICIOUS

PDF

86.5 KB Created: 2021-09-12 22:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c5b98ab5893af86b366797f9e4c32a9e SHA-1: a4b52649633c48f568d94b4ad4a536587eaa8881 SHA-256: fe8728e08f3a444aaccb4030fe37cd83493fd68f9e14c4ee2424418e28f4af5e
164 Risk Score

Malware Insights

MITRE ATT&CK
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 to redirect users to phishing sites or download further malware. The presence of JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=best+android+free+porn+games PDF link annotation
    • http://thienlongadv.com/upload/files/bekonulemubaduriwasesaf.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/jepukinobotemopadekuz.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/julutizutetenigepifo.pdfIn PDF document text
    • http://shendaoguoji.com/data/attachment/file/tokebaperu.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/11014130940.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/woxusidaxigufatuzululino.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/72847880954.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/11232410229.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/96607420179.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/25887847629.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/69465500950.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/geduxekedisi.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161314307d3933---kediwazixagij.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/gajukag.pdfIn PDF document text
    • http://aven.su/userfiles/file/sinatekekibol.pdfIn PDF document text
    • http://web5gstore.com/Files/files/96966604975.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/57979139961.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/cb2062522411981d18ed81294fef0e4b/taderiwetepefug.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/jevanoxexefewonaximu.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/4b425e2333b71e60b97c45d2818a5617/33234542808.pdfIn PDF document text
    • https://giaphutelecom.com/tctt/sites/aaa/file/fepilevusidipovivapo.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/20536303399.pdfIn PDF document text
    • http://trieuduong.com/images/Download/wegavekakiwa.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/mabamejovudatilab.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_off0000ef01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF01 10848 bytes
SHA-256: a6f28b68bc32871b1470b76b55c73285c6d35f7078b508cc3bfafd221cf50c59
font_01_sfnt_off000107d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D8 17172 bytes
SHA-256: a07e075b071968b6bdab1acf8977e98051fe4ba77d9f388f857245af6bed5e27
font_02_sfnt_off00013435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13435 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.