Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cedded6321d2d9e…

MALICIOUS

PDF

73.7 KB Created: 2021-09-05 13:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 868ffd50253aef0948b7e8420bde4451 SHA-1: e87ea42b6c7e5829ef4f4bf183843a149816761a SHA-256: 8cedded6321d2d9e098203db84d973ea4bf4cc8dc5f88b844713a0f14cdc0bc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF being a link farm hosted on compromised or disposable domains, suggesting it's used to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristic findings strongly suggest it's designed to exploit users through malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1609d41365e609---51623312717.pdf In PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160ab685b4447b---nodamakinozololupavuv.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/192069186.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/mujapagefa.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5211ba5f5---46229323482.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a36623a10---leduzalalebulowadux.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/48978281124.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/rbrm52ba9pjenv94qid2l5ta6b/17381832867.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/6414438473.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/91295626550.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/suxapudulugeloboxaxojura.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/97615469955.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160dae61787320---setemoke.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/nefenajiliguzutonisokil.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/1938489553.pdfIn PDF document text
    • https://sanagustin.cl/files/19920980660.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/jigasexalinuxixerogegapog.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/muzakowowoxeda.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/duxerolowa.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/4934220322.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/8422165253.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/tevefe.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/41644718441.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/soxokuruxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=platelet+disorders+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_off0000c053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC053 16104 bytes
SHA-256: ef496f22b159cc17292ab91ee8a50e04726bc2d470e94c6e2a48f3f80eb71b82
font_01_sfnt_off0000e984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE984 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001019b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019B 10388 bytes
SHA-256: 4a92b8085610eead064bbbc84beb4fec5c805f3f4335302bbe17cb8ca6353309

Open this report in the interactive analyzer, or submit your own file for analysis.