Malicious PDF — malware analysis report

Static analysis result for SHA-256 6353e05db7c45936…

MALICIOUS

PDF

82.9 KB Created: 2021-09-02 10:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5b7dcd6658fb6d7b64da40e1308eb14c SHA-1: 4884e6419c8c011c62ba5a660e989626b837803c SHA-256: 6353e05db7c459363789a7de74b2ab266ba140a52f8853d0ba806c4afcaf5a8d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cailux.lu/userfiles/files/94558859141.pdf In PDF document text
    • https://galerie-louise.be/userfiles/files/28621770338.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/fogavaruxowi.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/11972219830.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/32411939299.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/51304157384.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/sukitutoguzewik.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a35bb1c8a---40948659194.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/tekune.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a330dbaffe3---seroxidivek.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071791803b1e---megag.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752cdd6b983---bagalumulumevatub.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/91570786468.pdfIn PDF document text
    • https://egf.tw/test2/images/file/37230768910.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/19927800526.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/vobibebowexesoz.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/kubapusuvirunedadis.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16096b23790241---53603927395.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b19680e5992---98538249860.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/14179742982.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/625966a28f6a90f33893812f513db5b7/litolovukineturo.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/rezulajirifopalaxororaw.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/fetavujenipusa.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/32561901232.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/20252526039.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=upsc+prelims+result+2020+with+name+pdfPDF 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_off0000da51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA51 11200 bytes
SHA-256: b0c2a4bbe5439d02b0af8584a883d40673bdc744466c776f7c29dba6ee1d3209
font_01_sfnt_off0000f46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46C 18992 bytes
SHA-256: 3b78b620c9094444abc6ada747749622913bedba156496eb8173c59a2b92ed00
font_02_sfnt_off000125f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1