Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f0d0beb804ef0e…

MALICIOUS

PDF

88.5 KB Created: 2021-09-10 15:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 362bdf0aa67fa515ef78714d70a6dbe9 SHA-1: 29845b1909c0a06fc586f8cd5eab4dce297b427a SHA-256: 88f0d0beb804ef0efcd58a38b8a763ce7c54f1dd3da19ae99b68bed082ad1dc4
216 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, many of which host other PDF files, suggesting a link farm designed for SEO poisoning or phishing lures. The heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document explicitly requests sensitive information like recovery phrases or private keys. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or credential harvesting tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/8ba851762433249a83be6eb008ca0568/sotatov.pdf In PDF document text
    • http://ivankrivanek.com/userfiles/file/feximedinarif.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131d4ba8c742---xizipo.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/satetovatunivikule.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/82986490910.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/kepevaxolelomime.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/99242061249.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/sulobatofotiguxo.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342952f095e---sipemobifutozolefiruboxa.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/felibefagov.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/14437124796.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/batosavabuziwuperuz.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16130ffc39ed7f---74764474769.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/vetinabixidadi.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/loriguketud.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/33207496577.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/39242289684.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/woxenalukurofogo.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/bokovelupoke.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/18749057546.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/86780542375.pdfIn PDF document text
    • http://koala-al.com/d/files/84543249633.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/zimaxakokeja.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342d5a00d98---2772136117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=free+download+photoshop+cs5+full+crackPDF 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_off0000f20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1F 18504 bytes
SHA-256: bbd6cdf91c72d2794508698332adaac7750868e9587a159c276496e83b0696b7
font_02_sfnt_off00013a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A72 11016 bytes
SHA-256: c83dfa1a5106769933787383316c64bf1fbe18fcea062a50600edbd8a4572520