Malicious PDF — malware analysis report

Static analysis result for SHA-256 eba91da61d07bcc7…

MALICIOUS

PDF

76.2 KB Created: 2021-09-11 19:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 87e5f7841c2988d7781a550b8a8f7286 SHA-1: 5ad97f7a1f2c28475032a4746e87bcdd653db3c0 SHA-256: eba91da61d07bcc7387fde19d4f5ef100dbde908bdf2c647b8633e83b5a5f96c
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature. The primary attack pattern involves luring users through a malicious attachment to a site that hosts further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5058

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://digitalpolicycouncil.org/imagenes/file/27311542364.pdf In PDF document text
    • http://fitviewer.de/files/file/vununosusoxunodudogu.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/tuditaxokupo.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/57526979231.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/farurujuwodiwutadepelaxu.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/161303dd86b304---44786379943.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/26324976501.pdfIn PDF document text
    • http://recrute.fr/files/files/85004772827.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/366e78990398418b533df013cb379679/51046592642.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/bexakufiwetosigobonoz.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/wupasakofolise.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/fedavatokajetanug.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/77001823441.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/zopokebetupevifusiwe.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/gifavu.pdfIn PDF document text
    • http://bibikid.ru/upload/55720104533.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/kagimavodikedek.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/gunubazaguvopuvafuzol.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/80922244788.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/18503607462.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/tosadujelu.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/01jkbaqloph6438jhvo759tmjh/nebenomegor.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/43928752307.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vezam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=child%27s+play+1988+free+full+moviePDF link annotation
    • 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_off0000c76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7D 18664 bytes
SHA-256: 88ab1eeedb9db81855d0197b24a676f90ed671a63df8c3d295535655bbe96683
font_02_sfnt_off00011042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11042 11336 bytes
SHA-256: 4ec5a41c2a499cda1bf899cc563dbda3575d8a45eac61e004d35af76da4b13af