Malicious PDF — malware analysis report

Static analysis result for SHA-256 2596609deff633fc…

MALICIOUS

PDF

122.6 KB Created: 2021-08-08 16:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7cd0ad6805c50496cfa223195af84cf7 SHA-1: dd9f20fb43beb8fe9caf483251d5a92dbe2f17ad SHA-256: 2596609deff633fc2148dc142e5371d7dc60195be8d635d86ad30e6ce613ceff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure align with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://bravo-hk.com/userfiles/file/dugifotazi.pdf In PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a36c7e1c2---maxodifigaluduxorad.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/toxilolaxagebazixo.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/kotoxeserazalu.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/7740959254.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/89836910311.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/604d9cf0ecd05fe6059032cb724d9a7f/zefadoporifuvesinadi.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec1fac1359---51577840272.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160993001089dd---zexemimizogav.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/jirepefitu.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/rosugenidin.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/24650992287.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/newojesovopimevetu.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6b9b6505c---mevedimapurekumizab.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/zusonuvosejikadimuzaremi.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/88993537606.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/85503328605.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/517af25b9e5168cb5d072e48dcbf1d39/84279110550.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3747e3dfe6---34919164606.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/maruv.pdfIn PDF document text
    • https://paulins.se/anvandarbilder/178/files/50843908549.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/285e2a72cedc06c08507cde002aad683/49281936042.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/3a5a73e2648a4193b0e849753d20feff/sidipuni.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/11396627251.pdfIn PDF document text
    • http://standardamulet.com/files/files/newugoserejunuropatijul.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/18148747793.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+do+you+get+208+voltagePDF 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_off000175d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DEA 10764 bytes
SHA-256: cfa3824c7ceb6945f47a382fd83004f070181f44e317ff73b9a63c8d3df50302
font_02_sfnt_off0001a6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6BF 19888 bytes
SHA-256: caf0d62a83ac7e679da3940c6e31f43eccd10727568bfe299e4430b43c813471