Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb83edc857a9ce3…

MALICIOUS

PDF

68.8 KB Created: 2021-09-26 06:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f4a99749ddd3b9ed68a8c064498dbcfe SHA-1: b0bf919a6e99e2b449128afc40a4cab29c8d490f SHA-256: fdb83edc857a9ce3377ca200191c9ecfb9e1349885287a6f0a529ce76f0c9c49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting a link farm designed to redirect users. The presence of external URI heuristics and compromised CMS upload links strongly indicates a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://chcial.ru/uplcv?utm_term=mi+latest+android+version PDF link annotation
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1ce983ce5---razitatagaropinafito.pdfIn PDF document text
    • http://cocoal.com/uploads/file/zumuwejewalosi.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/nugejonawowawola.pdfIn PDF document text
    • https://anvatsaigon.suzukihungyen.net/data/dulieu/files/gilosaveledo.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/xemexedijuwa.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/roteliliduropemu.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613df48e9b1e7---negetufag.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/jodekutisasiwudidujadu.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/titozevajalivuxusuvog.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/47572560745.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/93050107804.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/nonabiwore.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/14517147706.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/xaparikogejip.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210915181959.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/42664336798.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/noxosirefetaveje.pdfIn PDF document text
    • http://rinsacars.com/files/others/lebanoxewewosogizatuv.pdfIn PDF document text
    • http://jamones-luna.shopcloud.es/ckfinder/userfiles/files/47599212334.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/63e74018c7715de9ca70755042792c24/lanebusijijepamop.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/mudusopexodeza.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614858516ded2---siwufumipovuxaxirekisom.pdfIn PDF document text
    • 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_off0000b145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB145 10300 bytes
SHA-256: 7e911e520e45daf0ec0723f462990ac8459f525dfce42a04dc570dfc0be760ce
font_01_sfnt_off0000c899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC899 14756 bytes
SHA-256: 8dca19c7990ea6fcf8fbcb2006a160c0e8040d64808abde613710de3dde7a4a9
font_02_sfnt_off0000ed6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1