Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2bb828ea7be2376…

MALICIOUS

PDF

708.1 KB Created: 2021-07-07 07:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: 75cb58f56b79579e1e736e6a96605148 SHA-1: 8bdb408306ebb7e58826f211c1e1fa6df4f2cce6 SHA-256: e2bb828ea7be2376e652b034b5704a288c8f83f22fae4e2bacc0272665b686ec
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6093

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 http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160772ade2a28e---58938938409.pdf In PDF document text
    • http://xboxheerlen.nl/userfiles/file/12665565083.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c35f9d80e---sabenubaraj.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160dd7a1a2fc5b---78424101906.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/6d2ee1c4cdf279974814e4e88ca40cd9/60003456485.pdfIn PDF document text
    • https://loctra.net/userfiles/file/zububenazategarafemiwut.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/aad6b69375398db114290955ba34f6fb/kapadajedifejidi.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/71146522694.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608255aad57a7---gemejumuroropa.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf952a44d34---puzevenexiwerumumegafa.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/rukaxe.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/66890109449.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/loderituresikanes.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/mewanukujajojap.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/977591fbe0246ee30934d9ccb2eae263/tufoxinutesumulik.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e531868ef---26783580794.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/14717928920.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16084d76347dbd---visof.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/letefov.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/c303430ae0c98fce1f69087b3c8b9327/runumefudokutusegusu.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/2s5apkfr5q9hjpk1v593dgjli6/36158978362.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/59350217432.pdfIn PDF document text
    • http://focostrade.com/files/20210703174831.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=ground+rent+doubles+every+25+yearsPDF 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_off000a9bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9BF5 18300 bytes
SHA-256: 68586eec253fcc20d61a9fda1ea9149f1b8be13c0291c7c060cf2ae0b5b92232
font_01_sfnt_off000acc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACC4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000ae46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE46B 10864 bytes
SHA-256: efcc5bcbecd56b5f31cb902495e86759d254b723a5f368b1700b18d40f648ebe

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