Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0ac3762c25b6fe4…

MALICIOUS

PDF

76.7 KB Created: 2021-09-14 06:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 93a37ff49d079bc819e0d2e1423688ac SHA-1: 8248c94c262debb8d1ec69176746e56dc1bcf58e SHA-256: a0ac3762c25b6fe433ea63877f4038c822a7af42713d897fd3dffb22b4b05c73
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URI heuristics and link farm indicators supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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 http://studiomistretta.com/userfiles/files/44197828126.pdf In PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/ruweketos.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/gafipixodarubu.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/66081518282.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613b180a74e17---sajilazapajovozokomunix.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161354699cf0ea---92760891636.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/wanajupimerovibifaxa.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff66834561---mowakenepebipapibe.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/222130630.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/25be67be169b6d9c93742a64d932165f/30134311162.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/j55sudcbg4eb7l7e6k9nvab547/65482925768.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139df03e1e57---35994757839.pdfIn PDF document text
    • https://rotitelor.com/contents/files/86865906938.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132fb699b279---wowejafulasowaxusu.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/vuwavekutezinadajilirif.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/tirakuwosuzaguxotuf.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/49487190789.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/bdb4f8be09644c535c9583e4576afaa9/43272810216.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/jafifop.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/sujunikepevexilob.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc139f0c59---pepimolafipisude.pdfIn PDF document text
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/godonilibumimared.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/soxudakebudowujikugeza.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/feturerexurizipelitewumo.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/48c6802bceec0dc9b5f1d50c63fd2905/jifozol.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/31397650466.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/lezugixoreponu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=best+cheap+gaming+phone+in+nepalPDF 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_off0000c635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC635 17228 bytes
SHA-256: 568fff983b8cbbd826a9d5c4b778ef67880871bf2bf8efd5d25fece9fd834bfd
font_01_sfnt_off0000f26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26E 10776 bytes
SHA-256: 7b74e1a83e34d9b62e627f6a521989d2e373921619ddafdbfe40a100e9cfb1a4
font_02_sfnt_off00010b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1