Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8fa4eb7c66a31ba…

MALICIOUS

PDF

82.8 KB Created: 2021-09-19 14:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b0b41bb258925419d59ec3b568a64ae1 SHA-1: efb5d5bf728a69a29393419e72c4de57fec3e6cc SHA-256: c8fa4eb7c66a31ba90eb80537ec8ede4f628da441c5fed969ea03ae7b47d54e6
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 hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/nmk1p9pnfq5djdojloo74g2lbu/41503803345.pdf In PDF document text
    • http://vino-charlie.cz/userfiles/file/latarelodas.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161356a2304127---monadugujojovemesupab.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/46455706710.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210904235042.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/47187865797.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/komegitimifuk.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/gerutenujotu.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161416295926df---zeratos.pdfIn PDF document text
    • http://fishingas.com/userfiles/file/80463770744.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/nefijivir.pdfIn PDF document text
    • https://mcsfood.com/images/file/49280675253.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/usg23otu73gf5b73hnq37g7vi4/repud.pdfIn PDF document text
    • http://starma.pl/files/file/83376121694.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/tulafajetagiberirasex.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/lajof.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/377e7e08e3b772cdd8d7fc67ba13fab1/52753218978.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/48122931794.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/31783124863.pdfIn PDF document text
    • https://dcicz.org/userfiles/file/9953914275.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/81150567157.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16141d9d41425f---mekaxobevikovuge.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/fajir.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/27328504647.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/piwoxarebiw.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/tuzitukoripogomofiwud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=gta+v5+mobile+apkPDF 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_off0000e151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE151 10512 bytes
SHA-256: ca08ffe8fad4c87da98fe3b7604e5d1695c5d2689cf95ede4cc96c5082979f78
font_01_sfnt_off0000f91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91C 17236 bytes
SHA-256: 41c7f0b40b6e61e5f13eabd8ce22c5497c54e16fd3cd0bff309adf561f53fbb6
font_02_sfnt_off000125e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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