Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4401df14aa57995…

MALICIOUS

PDF

117.6 KB Created: 2021-08-14 07:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e847ee9f8c413dd04bc5219485abc5a1 SHA-1: ca54fe44efe0d9052373120e05ff96350b855197 SHA-256: a4401df14aa57995289eb622f5c366c2caeb5ac2024c6f7e8680c8505c450353
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/3lr9bojvupuv2ujjr3kpn0k0g8/fiwanesovatokal.pdf In PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/1e5f8e812815f49f717f0ef1392c66de/12826886026.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/kopito.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/087b297908d13b9b300af29dd49bfb88/57343881790.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/magorunefatikatabesuxa.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/a28bf0b630e01def37b3c58156191130/28306746416.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5091464073---kufuzelebotolowib.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/ninatenalelifigezinipaxu.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/8613142353.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/77607569658.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/7458620632.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/sofisotu.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d3c58b74d---38962719291.pdfIn PDF document text
    • http://generaldistco.com/images/file/17337415232.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d71e2f8fc28---sosokojilabuletadiweb.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/e953gjoubu3hikulvpb60nmaas/50702317611.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/35caddf73b29fe6df702c35d1cf15350/89823869954.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/56124268216.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/68803806796.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/39763872928.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/20496055255.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/44545237596.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=mechanics+of+materials+2nd+edition+pytel+solutions+manual+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_off000164f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164F3 11212 bytes
SHA-256: 4e43e2eb9fd6ab440ba4f8c9f7549e1ae6f07811c66fa47763a1f17a2af62324
font_01_sfnt_off00017f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F0F 17816 bytes
SHA-256: 1a3348c98d8013c49538b9e12d115f3e51beac324855c541f851a6cb8efc857c
font_02_sfnt_off0001ac76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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