Malicious PDF — malware analysis report

Static analysis result for SHA-256 efcfd5d23e6cee82…

MALICIOUS

PDF

83.2 KB Created: 2021-09-17 18:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9f1b490a38c9670755dce7b59587a8a3 SHA-1: e44f14d407fa7e083819197dd012904df0d5ca05 SHA-256: efcfd5d23e6cee82e2cf3a3e23b5b5db3c017f65c99725f8425719c65496e39a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. Several heuristics indicate the PDF is part of a link farm, with many external URIs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

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://marathonblainville.com/userfiles/files/safakuwu.pdf In PDF document text
    • http://offerseir.com/basefile/offerseircom/files/ponobajidonapefemidid.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/xopetetopufitoro.pdfIn PDF document text
    • http://sinners-party.de/media/file/49762982261.pdfIn PDF document text
    • https://indikino.com/ckfinder/userfiles/files/7821823660.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/13740421970.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/80580302718.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/wixas.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/loxefezufimuzonuwebuzafet.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/zomageviludadetuperizas.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/75924797817.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/16513520767.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/21202510555.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/timomawa.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/86751967676.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/gixiwowexewavedijusoliko.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/lusipojolurokire.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/9c2efeccddf714e1b4821d2cd50aee2b/41846968752.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/tebixokisapesevadobefem.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/jakefik.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161404d1714065---27048548164.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/nutelewavibepetexa.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210916140751_gc7zag.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/tetoveruxajonilolalavi.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/85edd2b256c6b45b9934ab38719c684d/6009168008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=shadow+fight+2+special+edition+hack+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_off0000e018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE018 17124 bytes
SHA-256: c89570127907da5982f5ca8dc0512ad7d155c2e1129984a3018f466312ca3210
font_01_sfnt_off00010c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C97 11172 bytes
SHA-256: 509d35410b2914805be1713f1d3656e0e3602e60433b5d1521243a2c7cdb171d
font_02_sfnt_off0001269b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1