Malicious PDF — malware analysis report

Static analysis result for SHA-256 df151d8b82921f54…

MALICIOUS

PDF

73.7 KB Created: 2021-09-12 11:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a77d0de39624567651be7cf1e2d90d0f SHA-1: 70c2b8565bf29d8760644005f4f9eb1e49c97797 SHA-256: df151d8b82921f545ad4f5e9f32ee43304e1c5d2e9e197d99276d8c67b18eccc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and link farm heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://erh-hu.com/userfiles/file/92068100830.pdf In PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/xidiwujebuzogedokupok.pdfIn PDF document text
    • https://tivicom.vn/upload/files/mifudasik.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/darebudeduwut.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/bn28sukhslkivalmu02qgrode4/34720129842.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/zemosezuf.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/vumamegagavotanujagulek.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/76766009453.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2d6639d70---pugil.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/kojajitebogu.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/luwiwixejinugejofujew.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/24159949036.pdfIn PDF document text
    • https://attack.lt/images/files/tevudonasipi.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/37703254267.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/wurerubegepatowuxufojipaf.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/96077190109.pdfIn PDF document text
    • http://poledance-chrudim.cz/files/file/75446730409.pdfIn PDF document text
    • https://ijpdua.com/contents/files/83114389117.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/mapupuxegor.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/gexunaxusexemunali.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/64647703971.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/dc1cc63ff10b5861cd27f7073a2edf63/58630196826.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/posukudu.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/tfo741f53kd8qecsmj5h287k43/madimuj.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/vibapu.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/fejugifiwukexoxizejaze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=jungle+cruise+release+datePDF 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_off0000bdc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D4 17048 bytes
SHA-256: 7ee1542b03fc09cc7aa5482842f3ef18cf8f78bc1871456732d2b2ba7a76e399
font_02_sfnt_off000101b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B9 10516 bytes
SHA-256: 7e65d3fa01028f2feb855b600cc2f8f665364114aa9dddc1549e72c7eb3511bc