Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb85684eae44cda7…

MALICIOUS

PDF

73.8 KB Created: 2021-09-22 23:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3677d874105c89e04584dc61b491772d SHA-1: b0cb1966fc01f38b8dfcc4578334bbc1c1bd7dc2 SHA-256: eb85684eae44cda7e4a08aa24080cabd0347c2f640aed222bc12b48a30c3980f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=can+i+retrieve+deleted+messages+in+telegram PDF link annotation
    • http://leebyunghun.org/new/upload/board/files/sigapitunuvevutebosaweb.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149d753dbde9---83307494855.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109121218178030.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ea7fe8119---rinasedapunudux.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613894a8b4f60---rasosutulu.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/mikowuvurubarafukiji.pdfIn PDF document text
    • http://xn--42ci4cc0aric4a6dd7c5af9nef7sg.com/userfiles/files/goxidojukomala.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/84906933425.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614231a3b1588---35135524449.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/foruzevofejikerobajub.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/kepamexukiduxowewelol.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/17226306636.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/2262503167.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/nixikitejujap.pdfIn PDF document text
    • http://sin-hua.org/userfiles/zuwegero.pdfIn PDF document text
    • https://kimcert.org/E/file/gowojazizumekiluj.pdfIn PDF document text
    • http://sksound.com/userfiles/file/59058992651.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/vuzip.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/susamoxedapowadavepadu.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/77694702857.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/9041561230.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/larabepi.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/93483567954.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/l935r2d7o37vuj8kg186a738e7/notavutojokifulobowu.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/mogijofavidakifi.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_off0000bdb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C5 16832 bytes
SHA-256: a84d15d7c7170514b86743bc2205f618fb0e61111f7383198256e70da1558634
font_02_sfnt_off000100a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A8 10568 bytes
SHA-256: 444a37caea6d6bb4e480a5fd9a9cb221c3316502f25ff1635819c7d39df749c4

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