Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e1241f238630b88…

MALICIOUS

PDF

82.6 KB Created: 2021-09-21 22:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f5ad390f75a2f600ccc8e10b2f952c06 SHA-1: 28b4699975e42f0e6ac5836affbf8be8b32da0ca SHA-256: 3e1241f238630b887b7bb3d2b14f10764c424c0b892955eca5adde7503c80e4e
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 an embedded JavaScript stream and a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress upload directories. The embedded JavaScript likely facilitates the redirection or download of a secondary payload, while the link farm serves as a distribution mechanism for the malicious content.

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 http://serextion2006.com/js/upload/files/45703126880.pdf In PDF document text
    • http://zap-interactive.com/uploads/files/8304193544.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4fa7a7bee---72943265227.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/161306c040f579---86925921848.pdfIn PDF document text
    • http://poultech.net/d/files/20107887434.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/73390903601.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1b651d3d5---bomevutalepufuzedo.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/wogubasonusefanopodurog.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/31686892214.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210916_E0D540B799E3B80D.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/83171298380.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2kb3dp7p2pqo5bp4v6ofglmu06/telusurategazosezizo.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/68134514758.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/nuretiwekoxutudanojuwap.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/jisijakonikeropitawikiw.pdfIn PDF document text
    • http://balalajka.nu/media/voduzalevijipigivatad.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/wabuvufufebubusaja.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/dedeme.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313eef3f52e---kuguvapenetegagijavomupaw.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e68b36b44---90370382227.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/fodifivotofetesik.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/9467931059.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/71897735719.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=wwe2k+2020+game+downloadPDF 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_off0000de99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AB 17720 bytes
SHA-256: 267ac3f09bb50073dc45249c5d4944129c5d79e1f0d6a1c0c906dc98cca30b4c
font_02_sfnt_off0001251b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251B 10544 bytes
SHA-256: 3b88fa6bfd19b30079be003a26636f2195ef53abae4a37e7700773cc034c161e

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