Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc9a82dfa86e187b…

MALICIOUS

PDF

72.5 KB Created: 2021-09-07 05:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 64e8ed54268c171658c3c6e88ee96778 SHA-1: eeed3d8c79f44604652a2e29ed723095a8762acb SHA-256: dc9a82dfa86e187bfbe176a369daa98062790aafd2a91ba639fa7db67014ffd1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple external URLs, many hosted on compromised WordPress sites, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://mvmdigital.gr/files/files/gukanowogiwowimot.pdf In PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607889ecaff26---41536489503.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/897dae1c5c870d2ab45fe5fdfb9444fd/75062913423.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079a6ceda2af---bulizopiwegisevitareke.pdfIn PDF document text
    • https://krossi.ru/images/content/files/kotirizebati.pdfIn PDF document text
    • http://fvhs1970.com/clients/876770/File/1592105388.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a91810191---52875024372.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/jonizevajotawadix.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/35036700594.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/patib.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/3027781628.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/87796302491.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/73571038569.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094345d0ad10---wunifuvowuxusotipetijef.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946992a711e---kesutojagoweg.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/95e06dba63d371ac5ca92a70128f648c/daduxedi.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/lominosal.pdfIn PDF document text
    • http://amirmazandaranihospital.com/ckeditor/files/files/68167308866.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/sijoxidisu.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/kutemikaxotuwex.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079dc3200bc6---jozakukifog.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/13522724929.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/ravowijutotawafoj.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69953657715.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/jetukugulamutuxavikakuwup.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/91361356355.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/fometakusekutixanonolepop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=osmosis+and+diffusion+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_off0000bdcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E4 10408 bytes
SHA-256: fa85c0ae1f333c97794b67d087cc2f10193aae0ecaad30905d7ade34eab350b5
font_02_sfnt_off0000ed60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED60 15468 bytes
SHA-256: 40a737d257f49e8e25239097c5f37728b6a24303a50ea8b546f56418747e4e4f

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