Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed9ddbfdf9c905c1…

MALICIOUS

PDF

76.8 KB Created: 2021-09-14 08:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ca7fc4051b5553c64e6338e3e7a9219f SHA-1: 61b96e118a69623d79ef8d3bbc7013dc502ff2be SHA-256: ed9ddbfdf9c905c1906c9bad7fa46dd76578ba9ed4432c1a7abe51bc1b7127bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains multiple links pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit users via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://pincesorvarshop.hu/editor_up/pamoxularijax.pdf In PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/28512465092.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/niruleromugezazarexe.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/17911649453.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210906053452.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/73220905244.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/24740321176.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/vafubepazol.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/gotejuzegomoxofaxuvugas.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/fenoletivixadogoxipev.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/94906326944.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/5249436948.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/c57ad243adc27823f3f466426e772eab/mivaniga.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/gelop.pdfIn PDF document text
    • http://dgkno.cn/upload/mopix.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/jinosowojupu.pdfIn PDF document text
    • http://anduong-nhatthanh.com/uploads/news_file/wuwiguvobaz.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/resowalewulegoxofagasujox.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/d867c853g2rhr9crefn29s5vid/memoxoriledogos.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16136f50cb049b---nezudulekolimokasefa.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/buvajokuxidibilajovut.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/wiwulexetawebim.pdfIn PDF document text
    • http://cudicio.it/images/file/juxakadolexekoliwulopuvin.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/161380d1d63ede---54462469860.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/zokafaxaboloturejumo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=is+fortnite+still+free+to+playPDF 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_off0000c86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86A 17792 bytes
SHA-256: 0dacdd8aba273a1e9a8dbc40cc90db5b0e2fbe7502168fa8dcf102908640585a
font_01_sfnt_off0000f5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F1 10416 bytes
SHA-256: fb18c6cfed65cd92015355a3ebb46844df33eec71e7c2b32961c54a2fcdfe200
font_02_sfnt_off00010db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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