Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4d1b5435cf0b388…

MALICIOUS

PDF

71.6 KB Created: 2021-09-13 15:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 72f6e7dccebe759a4054c5b0a2f9e779 SHA-1: 8abbd963dbff9f3811074ac99cf048ce2b777ef0 SHA-256: e4d1b5435cf0b38858b07e36bb220ada328f4915942fc467cc8f21f2fa116750
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of a link farm pointing to multiple domains, some of which appear to be compromised CMS upload directories, further suggests an attempt to distribute malicious content or phish users. The primary attack pattern involves leveraging these links and potentially the embedded script to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ivankrivanek.com/userfiles/file/43465365913.pdf In PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/zusebutejemekaw.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/75404789154.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/lanutumukojigifunumi.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/64853177402.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/jezoxupa.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9ae2d821fe789a5844cb5f654f168468/96525809903.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/moxadelolemivef.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/kepevusaferav.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/tpi4uu34er69u23jhjde1u7634/rapipufeza.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613301f60d2f4---gevariseroxedemenikomuwa.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/39209339191.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/pupekuput.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/fenobefinatugisi.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/95955695962.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383745e97a4---kizudoselanex.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/53316450519.pdfIn PDF document text
    • http://topaslt.com/userfiles/file/gupitazupowi.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210902222630.pdfIn PDF document text
    • http://novafish.it/userfiles/files/guwem.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/lekedevunu.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/aee5a59eb09a61bcc94f04fd8b1faa58/27512049481.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/tovunoveg.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/95208750848.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/livididinegadugadagifu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=cool+games+to+download+for+androidPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/najefezukogepafedidawujav.pdfIn PDF document text
    • 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_off0000b99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB99B 10812 bytes
SHA-256: f1b54dbdfa05017c810cc9cca2dd5956260124b0cf7b490d98b272ff84461014
font_01_sfnt_off0000d26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26B 15208 bytes
SHA-256: 90d78aec5fbd02c084061c89862826e6a6ff9e6e9a227896b1e742d14bd9788e
font_02_sfnt_off0000f84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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