Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f7ee8045a38290…

MALICIOUS

PDF

79.6 KB Created: 2021-09-03 00:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fd88a0b5ef2a48255105e112df7ffca2 SHA-1: 73f910380c5d2c18dea7d8fbf5dac7b70b3c899f SHA-256: 52f7ee8045a382901aac7a293c95600a7530ed5d6658d21bcdcd592411cfc65e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, indicating it functions as a link farm. The primary purpose appears to be directing users to external, potentially malicious websites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://lycee-elm.org/userfiles/file/12821324009.pdf In PDF document text
    • http://thaoduocvn.com/userfiles/image/file/zetazabuki.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/52613985671.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/42322333847.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202107280554059465.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/4eb61f9f503824f532aefd7acd0ea562/timawewofesitotivenefi.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160984e74dc888---zesanofepedefigu.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/gn9bl4ddb7cdv8shuc1v4bo6g4/44777602482.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/jizon.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/70302805603.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128168e20fe7---vonofivajekizape.pdfIn PDF document text
    • https://morabia.fi/images/file/26432890028.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/uihrpn072l46eas402pkucpb4p/dukuz.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/9525222906.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/71858607928.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/28786972666.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/52967520040.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/vubomuje.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/nudedonupaleluja.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/manoxiz.pdfIn PDF document text
    • http://vizcsap.hu/files/file/dawulufasegiralije.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/xojizitena.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/35889899512.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=python+coding+manualPDF 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_off0000d45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45C 10632 bytes
SHA-256: d56db781d5a25b0e762e2c54ee23ffab329720a4197fd7d2ff7bea41219791cb
font_01_sfnt_off0000ec48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC48 16984 bytes
SHA-256: 81e84c206f4351d93beceac9c4b8906680b95e5e188dae6007e65d7c64222dc5
font_02_sfnt_off0001190e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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