Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c2e8cfc3bda23ac…

MALICIOUS

PDF

81.5 KB Created: 2021-09-10 03:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6f9a04035f947a4c048b930d5fb4c941 SHA-1: 9beee751d27f88670c8f596648b6dbd6b87df8b2 SHA-256: 1c2e8cfc3bda23ac488a3eaada79adff6b37b4010d99fea1ff36fa6d9b0e8a9b
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 point to compromised WordPress sites acting as link farms. These links likely redirect to phishing or malware distribution sites, as indicated by the ClamAV detection and ML classifier. The presence of JavaScript suggests an attempt to execute malicious code within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://crewmak.ru/uplcv?utm_term=roblox+codes+io PDF link annotation
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/ed19e4657201f00fc54f679c668c19d4/taxamuzevifazaribase.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/pulom.pdfIn PDF document text
    • http://yjccnc.com/upload/files/lilininugomazeripaberose.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/deniro.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/7618410234.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/muvixujunajig.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613437a5de63a---xovimofixad.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/v0urf6u1o1vc9mt4066tml97qf/10658049481.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/8000503276.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/29886740526.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/dufusarazaxasesamel.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/8vsb273rs0m54m4earaan330qv/nopagopefubatukar.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/desefariganolotokezil.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/jugoda.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/xefot.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/73375638086.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/batuwafotabawimaju.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/50036436711.pdfIn PDF document text
    • https://tallerescarrion.com/uploads/file/webojanavat.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/nowoteromata.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/6e5a5bf0df3d22013a604ec97097a14f/renofapuwusap.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/18380098895.pdfIn PDF document text
    • http://villkasz.hu/editor_up/4918805429.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_off0000dcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDE 10188 bytes
SHA-256: 9c00cbfe7eebdc931247be2e1c426ab3acb3978b5ce8e7d950e9212ffc7935b4
font_01_sfnt_off0000f3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDE 17564 bytes
SHA-256: 5ff87fa8bd2d32deb09ef9146517e2f715dfda7154bbb883b69bb052ff9a9601

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