Malicious PDF — malware analysis report

Static analysis result for SHA-256 e814e5fd52fc2de1…

MALICIOUS

PDF

86.0 KB Created: 2021-09-05 14:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a494860ce325f9844cd804bf69015d3b SHA-1: f7fcbbda3abf7244e5b9c260afe55236434d88ba SHA-256: e814e5fd52fc2de1e98acf86a468fdeab5d5eb4c5cb929484a887c6898674ed6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware delivery document. It contains a link farm pointing to numerous external URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to redirect users to malicious content. The document body itself is malformed, likely due to the `wkhtmltopdf` authoring application, and does not contain readable content, but the presence of numerous links and the high confidence verdict strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.
  • 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.
  • 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://autoscuolauniversale.it/userfiles/files/legodovaziwot.pdf In PDF document text
    • https://calmoinc.com/upload/editor/file/34096359065.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/83257771405.pdfIn PDF document text
    • https://tjpapigroup3.com/contents//files/68283532132.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/tadazejikuxirojowonike.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/80195584123.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608299d062d07---vaxujol.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/11315173757.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/vufenilajofagoge.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021073102463353.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1626228009.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/3d35c000af4e692ca55e6e12feeca5c5/49806240177.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/dufimosulasusisuzod.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/b30c0fbf15eac2ad7ca5e54ba78e1a4a/jiwalijaxugivevosig.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210620_BA885306070194D5.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210628222554116.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160f25a445bf2d---bimenifurubobisifimiro.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609024958cba9---vefidujore.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3c59cc10adf670f2954aa315e0214f4e/28976253883.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7cb178a8f---pemupoxotojerulapabofug.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/niwudab.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/36983338181.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/40335494942.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1610526f4b6a25---tubuv.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/82860875609.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16130522084966---17976624299.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=spanish+family+worksheets+pdfPDF 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_off0000e4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C2 19684 bytes
SHA-256: edadf7ae9495e3f10409f91a879fd2931ba7618284cff5f24a2bd4922015996d
font_01_sfnt_off000117ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117ED 11132 bytes
SHA-256: a47cfe058f09fb593bcf1b147620115849b5aa12b657a9bb6c94213ff320ebfc
font_02_sfnt_off000131c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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