Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a978e334718550…

MALICIOUS

PDF

73.0 KB Created: 2021-09-22 15:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0a78403609254eb9ca6c0907db62bfc1 SHA-1: 9bc26258a71d8c7416e3794cce1449e4aac2c198 SHA-256: c4a978e334718550315111b585deb4da825f9bee5d630a7d1536bbfd97d79431
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to obscure the final destination. While no scripts were directly extracted, the PDF structure and embedded URIs indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://tiga.co.th/ckfinder/userfiles/files/tojebulafejepoxelo.pdf In PDF document text
    • http://soncongnghiepjotun.com/media/ftp/file/bitoloveda.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/4e41a800116e4c1e9dbaf8bc07f1de0f/55792451930.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414294060a9---79450140374.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161408ef4438d7---fetaluzufo.pdfIn PDF document text
    • http://headrepublic.pl/images/files/40024150460.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210906004613978.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/vidonorutubudo.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/topajimadamitexasiki.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/edmhe866n8agvejs50f02kg956/2407501429.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/73911937692.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/33853507434.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae35de6129---togonokokamakana.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/laxeb.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/degejavetizupena.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/48419846706.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/79023338255.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210919/16320315811464.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/1514209742.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/005f3ec1c792c1ccfd2810fa2945112c/36854224978.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/ditetenofovonijoxevuwa.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/totivolotagol.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/85297861232.pdfIn PDF document text
    • https://www.confirmedtour.com/files/97209413506.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/norodibezobipipafajuwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=vidmate+app+mp3+free+downloadPDF 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_off0000bcd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD1 15892 bytes
SHA-256: deef42abe72a20285773a5ad526ca446a21676c93d159c5a9ef8535953d87ddb
font_01_sfnt_off0000e537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE537 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4E 10716 bytes
SHA-256: bf2a4be808d57cc8c44c4f7d5587469257234e8d904ba70164e8d4f8aec60ece