Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6c86049c586393c…

MALICIOUS

PDF

138.8 KB Created: 2021-06-27 02:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e3d6d409a92e6eb1383726388c82022e SHA-1: 0c4b92318924d924b5c1c9045cf595731b5d6254 SHA-256: e6c86049c586393c66bb292d0caa581b001f3ddbaca24eae0a080aa6dd1c857b
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://an-professional.ru/img/files/file/liminosedixudoz.pdf In PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ql3ac9rlmsomgsvh8ujg0ja5p6/jakerinugaz.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/gokawexilugakun.pdfIn PDF document text
    • https://spacio.hk/attachment/file/xawuvufuxebazewitapagupox.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16205921967166.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/sufisobikoweruwejip.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/18214180868.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/96619188471.pdfIn PDF document text
    • http://rld-carbon.ru/file/63350874830.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/5a1f7cfb490ff91a59b8425ca6c06e0a/9068775627.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/n9v0aj2rittv3annv64hv5d81g/jedavuz.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/f48e789bdab36276b9cf553a20c3addb/32968034006.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/mizinupukifozirixirod.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ebeb1fce0---furasaranapudu.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/a5ec6f71972a9264b6e1091bbbf58885/44028891133.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813a6f4c1e7---jababufovexizikuge.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/6paf2h6oqindc7ku7ne3o6oo23/maxepeberenamalo.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/075f10e834a73c3a2a1bf33cb3e3d5de/97395363664.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/8296b48c1bac6e9771f839a91c4da370/xafifepabogitawiweriz.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb11c4edab---76517943766.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa08a16932e---7052538287.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c876d81f81b---zuzojunaxaram.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8814dab4e---26949268503.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/16745830650.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/2586e7f8a770e24a4b9996695cd92cd4/wewuvedisenuvetul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=those+guys+pies+diners+drive+ins+and+divesPDF 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_off0001bf14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF14 10768 bytes
SHA-256: 943af801f4b8addff0eb64a3a1dda54c655abc4506ddb4ec92059623c6d0397b
font_01_sfnt_off0001d7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D7A6 17428 bytes
SHA-256: 184038708ef5c582dc7cd04dfecefbc9f38b566bcfd77483ebd64f3328c3d6db
font_02_sfnt_off000204e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x204E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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