Malicious PDF — malware analysis report

Static analysis result for SHA-256 57bb50273e22eadd…

MALICIOUS

PDF

77.4 KB Created: 2021-09-07 09:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 130b2d2d7cc7a24972bde6e34d05a249 SHA-1: 37ecb4ad45c4ca3641e4d85b2501b71dffffd8e0 SHA-256: 57bb50273e22eadd6cfa2ebd5acfc473f9d2990598f5df6a8c502e4f31ddbb09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure align with techniques used to redirect users to malicious sites, potentially involving embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://amadesafar.ir/basefile/amadesafarir/files/73471913862.pdf In PDF document text
    • https://augsburger-dartliga.de/uploads/file/guxaxanebupupibifesif.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/dufuxomefuwipatemewa.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/96685809946.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/3epvpff3jc7un2boabfvjdeu27/53131073667.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/burevevuwo.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16096b95889dd5---teketevesujufaduv.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/negalopiseratidipetovu.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/a7f27f97b7e060a48335fd005a5082ad/32781130838.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/60266358689.pdfIn PDF document text
    • http://wheatland1971.com/clients/25033/File/dunuvenumidexexetilikex.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607aac411c693---71373420352.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca650db27f---zikukesekurulu.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210825_5B3250A241A76CF1.pdfIn PDF document text
    • http://championsview.net/userimages/61066477482.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/goroxumemadosu.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7b76c17f3---31326617372.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/nexuvekukafadawibukis.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607732378728d---fosedusinegisogeke.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af95c156f76---janorafejedozoxaneturat.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/55100639091.pdfIn PDF document text
    • http://amandamaitland.com/images/file/texibopamasawewasa.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/161123fb1ecab9---logonexugaroxadul.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160e44b00d9ac9---60399381407.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=four+corners+3+workbook+answer+key+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_off0000c2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B5 19932 bytes
SHA-256: ca32be7c0ab661ce9b9e87155e7593dc2eaeae779d0efef774d338c2547d17cd
font_01_sfnt_off0000f5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFB 11056 bytes
SHA-256: 292f6341108bddb91c17d700eeba65cb594ffd739298bcc9c8f5ff21d6d2061f