Malicious PDF — malware analysis report

Static analysis result for SHA-256 395067ea1ea0318a…

MALICIOUS

PDF

80.3 KB Created: 2021-08-07 06:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 647a26d52f5ce977cd22e8715a856f74 SHA-1: df406caa1807627485c8b38a1d5aca29137e8cb0 SHA-256: 395067ea1ea0318a2bc633f00fdaca47234be16fe7e83cfa0426b749cc6e5f20
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to disposable hosting or compromised CMS uploads, forming a link farm. The embedded JavaScript likely facilitates the redirection to malicious sites, as indicated by the ClamAV detection and ML classifier. The presence of a download button lure further supports a malicious intent to trick the user into downloading or accessing harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=doulci+activator+v.2.5+activation+code PDF link annotation
    • http://www.themixchange.com/userfiles/files/gofasebevuwu.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/51527917571.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/19480794635.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/nakebugolefenap.pdfIn PDF document text
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/89564386094.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/71973091177.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/76047870111.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/nitaguxuvegiwimodituguduf.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/renojilidakukesugus.pdfIn PDF document text
    • https://kede.org/userfiles/file/votilolaxipusanevexido.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210516195334.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/xifovadafog.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99bc80bb53---36873729086.pdfIn PDF document text
    • https://actorconseil.com/files/file/54804921809.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/vepukuzumuwezager.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/dfd9fe1f08b4d027df025aa3b5ab5421/funovor.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5562f1291---luwadipidekakodavalot.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/11115897685.pdfIn PDF document text
    • https://www.neosynapses.com/wp-content/plugins/super-forms/uploads/php/files/36sr8rog94vj8i7vd7qap2m6j6/20813615859.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/jadepekakapepajenof.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/2adc01df6d41a68deab383e6faf26206/kinotazelanalaginob.pdfIn PDF document text
    • https://afayl.com/userfiles/file/63116347874.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac692bed6d1---kogaf.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/0d5295caca64a71805fe5768b1b062a5/57744434294.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/58316605560.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/69686251302.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16216883221249.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_off0000d602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD602 16688 bytes
SHA-256: 4575219fa138327f9eb5d1b3ab0b4bbfef5e2c2469d91c26977f2dd65ca2f54b
font_01_sfnt_off00010184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10184 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001199b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199B 10684 bytes
SHA-256: 5e821269a6748a52a03957862c88f8c0efad78e562d2da0db1b571f4e0273611