Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f5a4f0aa3a6be46…

MALICIOUS

PDF

92.9 KB Created: 2021-07-07 20:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8f7cb023886b6fa6fa4afe82227f100d SHA-1: db1f4696bd44816f557d615ab501d6c4992b7eff SHA-256: 5f5a4f0aa3a6be4676a731644a9366667ff96ec0976aa79b818864edd3b711ff
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The presence of external URIs and the overall structure suggest an attempt to exploit user trust or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://luminex.pl/upload/file/lusezatusonekoviru.pdf In PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093351a6ddca---10862087012.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/56460189368.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082abfd743fd---juwefujajozipaxixidogiker.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/ee8rn1omvo8374mfj48bfc769u/xatinira.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16070e76fd176a---56212037658.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d0b0b5f21---79745084723.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/l6ouqjaga7v3gb75tgurbb9lj1/15739880014.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/debavakavikejikapa.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076fa5bc54c8---fomovisexakowabowutixi.pdfIn PDF document text
    • https://vestol.bg/files/file/xesulomopavedowinu.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/7e0309277cfe4f4af38ee75468d37d90/nirorokivasasafeluniwalar.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/dafexowutipol.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/17629987826.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086f823bed3f---lukobetekefujuwimugexejup.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/73943990887.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/066c06e510f4e8db44eadb6b5d5a0d5c/63253624902.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160870de5c664f---kowubefikajezo.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/3vs8c3f4b95kp4kkd1vn3gqj48/fegigekoz.pdfIn PDF document text
    • http://nbpcpentecostalchurch.com/clients/65183/File/63818031091.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/qdeo5srncvlo4cili9gof4r4o9/69920875478.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/vabowumedim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=brand+activation+plan+examplePDF 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_off000108fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FE 10728 bytes
SHA-256: 4cf5043058f024d78248945305aaa77959cefb5859117f6dfc8a8e63435d7b57
font_01_sfnt_off000121a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139BB 16672 bytes
SHA-256: 51ff59161d06b24f2fd3a8c90cdd8bab225baa3e7f4855bb99b86fd57218b747

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