Malicious PDF — malware analysis report

Static analysis result for SHA-256 8348ea087248a0b9…

MALICIOUS

PDF

78.5 KB Created: 2021-06-28 07:20:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e5239d9d9d28a555276eede7ad7e0534 SHA-1: f3e389daaf933edd779398f029df4e0d82cba89d SHA-256: 8348ea087248a0b945aaaf4a781a4bb928a313a32c416f16510832f41750fe7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing attempt, likely to trick users into believing they need to pay a bill or track a delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607470109193b---59091635435.pdf In PDF document text
    • https://devcons.org/uploads/userfiles/files/xifutexoseza.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/c07cc4f0cba53c0949ee27b061cd4646/71131646686.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/d022f698a0d5c95fa429b385fada73d0/mokokasivarebemajulotape.pdfIn PDF document text
    • https://activepymes.com/pub/file/refovikel.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/82366834746.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb00964d17---76189394382.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/59251659572.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/mapunixosuf.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/86473761923.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/100becccb1db3f800dd3c2ece954b9ea/59286336759.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a11cf37f611---nevuboze.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/defe2cuh47t1i5ou3o6lo4nk4p/benododuxipatuzivonulizom.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160d6aa144b980---gazamasiwonilaf.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///kefulibakuganuvet.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/jesapoj.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/e91bd1bacef5c2bc39220ccbae6ed1dc/vuzebavibapovupazezola.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/aca4423446df5a6ef7ba4ac46f0bc5b8/jerovekiratarijiwopuwig.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/femotoja.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1246cf52b466d004f34c96d67ca62a80/49184976620.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606facdd9fd88---2035664699.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/c31a23946bfb36caa5e4c456bc85a010/72843045921.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d083ac1ee9---40576217119.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609de7e5607d5---53103158998.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/dc3a393a0854d462ad70a0f6bde7b275/70666239247.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=evine+bill+payPDF 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_off0000d2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EE 10064 bytes
SHA-256: ae6768ae9c4ca53b7a6691d5586f40c9e4d2e62ce9d364d6e4a045021bbca467
font_01_sfnt_off0000e922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE922 16804 bytes
SHA-256: c97b63a235d501e2f527c21d87bb577bf1dfbde26a9fac4744044d4ca5fd20ba
font_02_sfnt_off000114dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1