Malicious PDF — malware analysis report

Static analysis result for SHA-256 95dc55232a2cfdae…

MALICIOUS

PDF

84.7 KB Created: 2021-09-15 09:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b3ef395b74892126c70ebc14c2115b5a SHA-1: f6602896b020710f2e5f41bbd0d68442e61ee507 SHA-256: 95dc55232a2cfdae6b16d69ad5b3622206f24a6d3f96d8a9c989894d603e31ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as a link farm, with several URLs pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/susevafametujenasolud.pdf In PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/a992fb3cfc00de531f3ecb3b505409c5/tivamovumevare.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/dixuxasibobu.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/21327786018.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/5921407644.pdfIn PDF document text
    • http://halongwave.com/userfiles/file/bariganujerasop.pdfIn PDF document text
    • http://uco-kampen.com/media/files/xireguzef.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/vmsrmih7etoodl80vqs1vls4c0/88414799288.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4750e4732---24698479886.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/46890611753.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///10506089727.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/witej.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/55920087852.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/kamipux.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/46234693481.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/43711179021.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/30436418664.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/9226516041.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/nileveza.pdfIn PDF document text
    • http://rongqichem.com/upload/files/35693183099.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/9m46aemqq2123amhcg9ud08jo7/9186377936.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/jogobowunomulebagoxog.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/37308049252.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/4276432593.pdfIn PDF document text
    • http://mislenyiallatorvos.hu/userfiles/file/laxofojo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+connect+broken+display+phone+to+pcPDF 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_off0000e328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE328 11036 bytes
SHA-256: 9a6bcfa12c97aa472c280d70d374dcd75d05c019be113909e12b4cc33617b283
font_01_sfnt_off0000fc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A6 18596 bytes
SHA-256: b1a33f18d7a28703c7d269e5a992448435ec213c8cac12b95def335a0b281cff