Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a2f12f3e157e52…

MALICIOUS

PDF

89.4 KB Created: 2021-07-30 01:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 015c8ae36992c71ebb3124e42424ebb6 SHA-1: bccddb1f9738ba6c648e86ef6ab6fabf09a7b4f5 SHA-256: 84a2f12f3e157e52efb45ff744fa51aff0d950d1afe66b07fd04f2c8e3ad6b0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://creteservices.com/FCKeditor/userimages/file/64557801181.pdf In PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609a96f91f1b2---71522995706.pdfIn PDF document text
    • https://xn--mgbaf4adbs1bd2i.net/upload/ckfinder/files/16472169273.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d4f9467ae---sapozadufokomisakil.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/39f21c4caedb8859b0f1a12be6b86873/79903135283.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/83911356592.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/47265481778.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/b87b5c1285748d26e9538981d9f7d56d/gukuzudokikop.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/76915518141.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/70947877735.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/voqd67iul7ids5f2us66b7fb32/tirurenaferarukuk.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/rafuvi.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/adcc818f9e40ba1c4148c16d716cf726/tokonuteza.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/5568358379.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/88348339076.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/nifoxuferubemozosane.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/af427b6d531c45a599138d835a837ab0/31966572294.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210618_B7F52F8C17FC7664.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/goxuvixofokezapojeseme.pdfIn PDF document text
    • http://axwelindia.com/uploads/penegesegopima.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/f45ef9fb0bc640d6edd8a5fb343b0445/duwapovuvid.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/42273915209.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/29607163450.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/3da1a2883505b3a5afe377dca9621b46/26551847246.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=aarushi+talwar+case+judgement+copypastaPDF 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_off0000f9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DE 11372 bytes
SHA-256: 7b1fa993c0742a0394accbb58882d6ef51196dfe85ddc7d409b426b743bb7607
font_01_sfnt_off00011457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11457 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C69 16504 bytes
SHA-256: f6aa0eb2aaaee44a8e1b6828b8cd1620236892b497ce1b7eef1cdccff362f77a