Malicious PDF — malware analysis report

Static analysis result for SHA-256 f728d10835750944…

MALICIOUS

PDF

180.2 KB Created: 2021-08-06 11:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d6f0ec3f8af38e75a986767278a1bd2f SHA-1: cdc719c8b75d322af99783997b41a5a93879685a SHA-256: f728d10835750944f224ea642598bf91eae0a1740524374ad3f672ea5c95de87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The sample is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. It directs users to numerous URLs, many hosted on compromised CMS uploads and disposable domains, suggesting a phishing or malware distribution scheme. The PDF's structure and the nature of the linked URLs strongly indicate an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://izometal.net/mm/file/dikeken.pdf In PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/ba7a1ab90949c0009fa0da7045848902/gibapiwakubuwi.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/5b7kkaiss2cnhai8lj3gpl5m84/zebogin.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/noxofifekejojiwenipuluw.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/886c7cbe2cd7c8cf40342b120ee66854/dijokoxapeteta.pdfIn PDF document text
    • https://bloomeng.com/uploads/22986969152.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/29638949379.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/97399935481.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/ee99c4b891a72152dd41d675f85b81ad/89118689540.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083700def7c5---jiduxukuvatikuxubapal.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/selenatuwuzimuwegevuza.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee486fd0b53---10033402825.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/7a99a4c8e521b93aaa6344126c12744f/18309175640.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/58a3435fd30784da988b010101e011dc/gixuwegobiviwivabolij.pdfIn PDF document text
    • http://compsult.net/userfiles/file/38499875532.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/8103b6ab38f9277a4fa57ee0bcf29ccf/60660554897.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078579d5d439---wilalopigosused.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/nerusikesivijoz.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16077a89b612bf---fikizixemun.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/2442dcea2d5076e0af2d7008d0d79c0c/dejawapunaziwavepijijo.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/maborobedu.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c33a9e7fe---kesexezemipesidabuzewexo.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/22101791235.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/kekuxup.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9ecb5543c---80150235436.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=chittagong+city+road+map+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00024220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24220 10864 bytes
SHA-256: b6b922d9417c8ae139fe1374af08ecb4d1efa505d7298d50fb84be2cbeef83b8
font_01_sfnt_off00025ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25AE2 21604 bytes
SHA-256: 2eb4d25917412fecb85c50c436744156dbc68b49c9b44acd2f24379e02d4bcb4
font_02_sfnt_off000291a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x291A0 16732 bytes
SHA-256: de4523fb2fb09b05ac2557aa14ae001aa2dcd06a0fc56353de66837574884745
font_03_sfnt_off0002a997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A997 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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