Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff6d26baeefb91d…

MALICIOUS

PDF

82.3 KB Created: 2021-07-09 05:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a4445bda341e6ae00e9b75a3276069ef SHA-1: c587940d318d08611b1ba5b707cf53e4b155265a SHA-256: 3ff6d26baeefb91d8da0839945f61510cfafc50ff8ba26ae560c37aa65f061da
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, a common technique for exploiting PDF viewers 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 sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://taketty.xyz/js/ckfinder/userfiles/files/61428388758.pdf In PDF document text
    • https://dm288.com/slicice/file/zetofesituxamex.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/bfd7d5620d0a5a1793c4c13200b6f541/tasakaxulurosukubamu.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/51351935341.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/vesiwofugefewego.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/bozitusemuvapon.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/sojazivunexeru.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021062115290113.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/mibosovebelawuvutugabo.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/88e89cf0f6e4697d181d7fb312a50291/21192213126.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/podoxedux.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/7mndh6gd50vdjfn1udj0l8pbr3/26348889663.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/12e0fa815f6fdef64419c2520a67bf1f/juvebikewab.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/13618868049.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/e3b5b3c1990495dfd7e3a08e1054aac0/16539577156.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/ce32fe96b666805dbfcf71b957ada790/xusun.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/zuwinelajivevowizopoxut.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f231a7824---ponotezil.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9664594c36---99931390667.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f57b9d0ee8---12743093477.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/68856178888.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/rozid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=get+the+hang+of+somethingPDF 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_off0000db62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB62 10556 bytes
SHA-256: 5c7feb6b2d64064798f85676601d7dbd57f2ec03fd89c495f9ac53c20eb61779
font_01_sfnt_off0000f34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34F 18020 bytes
SHA-256: dd220e8a23c4ebec89bded44acc11460f7c1057878bb0dc3c0be54099a82a9de
font_02_sfnt_off00012281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12281 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1