Malicious PDF — malware analysis report

Static analysis result for SHA-256 d286ae1d51b8736f…

MALICIOUS

PDF

84.0 KB Created: 2021-09-06 02:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a49d61a27420bc6052839067da4201cb SHA-1: a9652c9a064be7504b0e507317ddd98b189a937f SHA-256: d286ae1d51b8736f210544c75ebbc0bf8aa673181d30b126907e6ff7c57da6c4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external URIs pointing to compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware-hosting sites. The presence of embedded JavaScript suggests it may be used to further obfuscate the malicious redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://nomylo.ru/uplcv?utm_term=endress+hauser+mass+flow+meter+pdf PDF link annotation
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/e037a47bf7ea7c997d21a6d36a60b0c0/tasosinanijajujosibobedaf.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/vasoralakekofulaxodenuke.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/mvg4g6bnkhu3d4ki6f2ilbic70/51270288093.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/81104612265.pdfIn PDF document text
    • http://stylekd.ru/files/kokaraxedakomepukosowas.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/misimezofiwunepabozuk.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/josonokivi.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/5d8faa11d14d8a4c627076380448e803/gujogexoxujuzimerunoreb.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/40675246092.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607d61314c50f---46355248481.pdfIn PDF document text
    • https://binhvi.com/upload/files/1789271963.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/54cc01c6aba8b890002ba08fca7bb8c1/riturijejigemabimigovepe.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/77466460136.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/nonexabazipabepazedid.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ef8e49b1481ddadfa525069dedc65bfb/99823801116.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fbe5136dcc8---19239786527.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/34668247439.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/velajosirefuwulorelokovaz.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210530152042155.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/55937878052.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/40710990963.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_off0000e2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E9 18064 bytes
SHA-256: 800c318b1cd905e8b8e61fbc29993ffdde2870fa7f55df9f5c61a9db7a925deb
font_01_sfnt_off00011191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11191 10840 bytes
SHA-256: 239acbaa9445fa6d6eb1d523c3438a553869c6f52657a44bce36ba753ff5a494
font_02_sfnt_off00012a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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