Malicious PDF — malware analysis report

Static analysis result for SHA-256 1714860d641ad66d…

MALICIOUS

PDF

78.0 KB Created: 2021-10-10 08:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2584b7699ea4c065ce8713ae7174b0b6 SHA-1: 75696a64b87a9c51c835e25fa354b80155d2a1f0 SHA-256: 1714860d641ad66d6426b6c349ccc2d63f66f5074c8dcbcc02d61bebf8ce42f8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The document also features a link farm with numerous external URLs, many hosted on potentially compromised or disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. The presence of embedded JavaScript and external links indicates a likely attack pattern involving user interaction to download further payloads or visit malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://laborke.ru/uplcv?utm_term=the+blue+people+of+troublesome+creek+worksheet+answers PDF link annotation
    • http://theclubburger.com/uploads/files/jarigugodawusugaw.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/70070327752.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/73754361217.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/nolibi.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161346a45859b5---xemadudik.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/96768483264.pdfIn PDF document text
    • http://dytac.hk/userfiles/mifijinotodu.pdfIn PDF document text
    • http://jonme.net/ckupload/files/34200132271.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/55133406869.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/10038172724.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/52941412406.pdfIn PDF document text
    • http://kammed.com/userfiles/file/jetuzamosuliwexomepizasa.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/5955121582.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/malisopa.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/83095320920.pdfIn PDF document text
    • http://gapp.fr/medias/files/nasoruzumamaxevokuzegofu.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/bebonatemuj.pdfIn PDF document text
    • http://tulga.ru/editor/files/45914216624.pdfIn PDF document text
    • http://ausafe.net/images/art/files/mumupusewujafesifetok.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/83299168656.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/kinijowuweradisanubigumo.pdfIn PDF document text
    • https://alpinashop.bg/files/jasuw.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614914e24ca84---vokixizemofosebininadirox.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/mifozotabu.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/1fuulv62uqb702l6a7ai8bq6ve/naponerade.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_off0000cd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE553 16772 bytes
SHA-256: 0b116a7d0c18c4a5188ad142a88c34412f4e5cf92e9da6e563fb1a8c6676adb4
font_02_sfnt_off000110e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E2 11036 bytes
SHA-256: 72a37c9bbe63a4878c472138fe967435d2ad6fb7aa8e8c9772153ae56226619f

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