Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6ad14442bdc1c95…

MALICIOUS

PDF

73.3 KB Created: 2021-09-24 01:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0163b8f7617665d7013dc3988476c7bd SHA-1: c543d5ce70239dc79877ef9842abd79d230ce68c SHA-256: a6ad14442bdc1c95a4e38d41a4f70e2e68244388ab4902ae7183e2b4b1c6e67b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains embedded JavaScript and functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://pixomot.ru/uplcv?utm_term=big+sur+jack+kerouac+pdf PDF link annotation
    • https://wedding-photos.cz/userfiles/file/dovutijuzobasana.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/69663582004.pdfIn PDF document text
    • https://j26clean.com/upload/files/gimexugisaf.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/48875014008.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/77241482490.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/52464181680.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/domoxokowumuzesolowawu.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210905052415.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/1c2a0cc254def23e70cb9884597adaf8/jogojikudigebefetelegakig.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/netujetofukebotipubomeraj.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/wasonidevevuwajovabuzoso.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ae4e5866e---lupadof.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca35735303---tuzunugeduke.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/fuvajidu.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/22782022801.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/9275906309.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/34442581872.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/wogomevikusatowilusun.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/tozetekawikuzebir.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161437c30ac38a---2443258573.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/gabibufenozesomalitonufof.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/71920758690.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/3bb8bf37454b7b11b615aafea494219b/14850954724.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/15455871135.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/60231118067.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/42381555719.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_off0000b879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB879 17812 bytes
SHA-256: 6993f07b65af3ff3f2f7c20219d65d90ab1a069ae59a44f479e1f55f5476dbb7
font_01_sfnt_off0000e638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE638 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4F 10920 bytes
SHA-256: e9da4ef6a4c869397a0e84fd5c4e2e1a516a9171e122ab4c5dbe6dabb0c9e722

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