Malicious PDF — malware analysis report

Static analysis result for SHA-256 68cff595164e7df0…

MALICIOUS

PDF

227.3 KB Created: 2021-07-17 19:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 83526d6ebe40adf57d42b353c18bf16b SHA-1: e6fdd20180712c404b1aab45f438435be6ead414 SHA-256: 68cff595164e7df04ade43725d120b8acc8e706eadd04f5127648501a12bfcdb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. Several URLs point to compromised WordPress sites, suggesting a link farm designed to host or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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.
  • 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://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afb6ed5be4d---77156831433.pdf In PDF document text
    • http://icltindia.in/userfiles/file/logupiligud.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a750fb6cd3---39133914651.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/12250019265.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b2bbc1eef---jarumog.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/vafibi.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160713fceadb52---20480401277.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991fe4ebd19---72029182287.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/zavarozonosaguz.pdfIn PDF document text
    • https://shopabrang.com/images/files/kitikavu.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59fd5f4133---zodozavelezilag.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c679812aa1---48890284039.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/5dc4ec75af6db746ee224787cd3382b1/80969610022.pdfIn PDF document text
    • https://timjanen.se/anvandarbilder/53/files/75063691807.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bdcde8326---40334701092.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/de0133e92be3d06a7b2baf0c2a0bdf26/jejimixokedurobikati.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607250e9e1c02---68309678824.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16071e0127fb4e---76600304756.pdfIn PDF document text
    • http://nmglyxx.com/userfiles/file/70259957614.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/2dtpl5v1s2g01q8c3h1aauj4rd/46872139019.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/ragavatanureja.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd99fbe4513---gamewezawinaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=physical+pharmacy+by+alfred+martinPDF 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_off00031a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31A70 11020 bytes
SHA-256: 096ac6bddd4a5143cc26f67d4d33ec9cacb8e42ff27285401ec30a84e996a211
font_01_sfnt_off000333a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x333A9 19256 bytes
SHA-256: ec4fa25bb01db682a9a48aa8f78eac0535e3ae45e86f3fe19da4bb7fd5da2f05
font_02_sfnt_off0003672c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3672C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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