Malicious PDF — malware analysis report

Static analysis result for SHA-256 839ef685add11003…

MALICIOUS

PDF

82.8 KB Created: 2021-09-15 19:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8348fb463333ded8f12eb97aa44997e8 SHA-1: da175aae45b2493810a918e40f76ed6fe801b936 SHA-256: 839ef685add110030750a36ffc3ef3b12fa05ab2000c81229b4d7b2a8f3005b2
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The embedded JavaScript likely facilitates the download and execution of a second-stage payload from these compromised hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613979eaf046b---zilipadobevopilozi.pdf In PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/mowavakemekofani.pdfIn PDF document text
    • https://advantage.ee/media/contents/file/repuxokefofuvo.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be499c8e5b---kosizixigolujibazidovox.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/e66a1c804698d69bd67cde8dffb9a81c/69987503023.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/liwulo.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109081511389065.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/96567221599.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/luruvumisuvajepulivuzola.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/xixopowa.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/db9c4af60415c22a0d30f53dbfd62720/zojojenalifokogejewus.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/48998359276.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/pinomowen.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/jaxukuwasov.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/samodezufuxakoge.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/jigarupikaduzofudululike.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/dojev.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/39242791489.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/53149641449.pdfIn PDF document text
    • https://phukienbep.net/media/files/27516229280.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/vurunoxalekizogumibak.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202199_18359_605.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=best+park+in+the+universe+apkPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/mivimufaxumemakeboz.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_off0000dead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C4 10492 bytes
SHA-256: 8a6d65a17477e1f74cf387a02dae38ba011ece269d02d10973aad4de69b176bf
font_02_sfnt_off00010ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA2 18260 bytes
SHA-256: bf6bcca9b1b3aa87f1251e704c519da3a9841300fc022fcf9e2efd9301a0b7ea

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