Malicious PDF — malware analysis report

Static analysis result for SHA-256 559938d73b785a30…

MALICIOUS

PDF

86.2 KB Created: 2021-09-11 11:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 914c0b6555a84a0c1d19927edeafa611 SHA-1: 1a90aebe35f085c0faf4b1bc5f618ccf938b522c SHA-256: 559938d73b785a30d5d9aaaedff5842ca02c9fe29c95df36435f899156c2eb48
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm characteristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tehnicgaz.eu/files/file/88097863341.pdf In PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/tupig.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/a2b5be660034c57c8ee4cce4d1a565d1/33612013466.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/wisinozoxaror.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/libaluzisigal.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/fesirufilorosoxenuko.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131d55a1d8da---ribodukidakexigikaz.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613203a665a92---tufos.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/21063487633.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/98446920022.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/28099504511.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/modelixuresiz.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210905_035550.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613b95e2b8554---53711879688.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/niwujetagakabopuj.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/rodomumifituwufutafame.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/30315753016.pdfIn PDF document text
    • https://kar360.com/resimler/files/xufiku.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/5ab11a1f34d7bd8b801fbda0c1e997da/9429078559.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/86461073528.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/71387469876.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/tajetefel.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/21770422879.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=a+quiet+place+2018+onlinePDF 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_off0000eaf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF0 10828 bytes
SHA-256: ca66d2c666c3d65d0b9b6f2b9d3a86b50152e3a6b2d3cebe69801baccdbe6a13
font_01_sfnt_off0001041d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041D 18284 bytes
SHA-256: 83bd389249fe9616f5a64f69fc6b321887c739a612c733f24e89b6b1c9e6f1e5
font_02_sfnt_off00013398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13398 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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