Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fa21b2a74128a26…

MALICIOUS

PDF

82.8 KB Created: 2021-08-29 10:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 5fcf32c248f2221fd9f8374d06f410a0 SHA-1: 8fcf7e62b659bb643f514a0bd58e8b443359b1f2 SHA-256: 1fa21b2a74128a262a4943e53152f8ab139add91743579d761c24b5c310dc3ea
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious content or visiting phishing pages. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a deliberate attempt to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160af5170cba61---sunasijowagerorowerawab.pdf In PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160955ba31204d---liwatimukaxetewizilo.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/rodarirekemaratabe.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608894bbe3f4e---mupojokalikezezizokida.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/5080051445.pdfIn PDF document text
    • http://hyundailed.com/upload/editor/file/67284935955.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46a6f140ce---musabez.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/54760267454.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/motuletawudib.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/12dd0bd9339da801f135e865e32e8119/seluxuviximozoge.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/25344339043.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcac57ee06---77922166843.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/kogozapurodufigozosodotob.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/171450345093.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/91045950673.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/jijemugasikazofusevu.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c09036f404---15919304180.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/rezozewanur.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/faxur.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/11725608708.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=layers+of+the+earth+projectPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE087 17016 bytes
SHA-256: 076d6e0b9fc8ba920c99051f451642293c2f31f9ba74021ea3a2dba585a17259
font_01_sfnt_off00010c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C24 10536 bytes
SHA-256: 2d0f2b47ed80ed9bbb4ddd62d5fc0c1a46a882911d98c0d510870b45cb693d59
font_02_sfnt_off00012460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12460 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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