Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef79fd8ef734a632…

MALICIOUS

PDF

93.3 KB Created: 2021-08-08 11:41:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0ddd77d3d7ad1f5d7366b0dd79010e60 SHA-1: 2bdda9558d37b9e5b1ac4e4790d095fc33911a3f SHA-256: ef79fd8ef734a63286bf3567241a0cf1d36f282039a21802bacd01e8aea355aa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content or phishing lures. The presence of embedded JavaScript indicates an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=la+maquina+que+cambio+el+mundo+epub+gratis+espa%C3%B1ol PDF link annotation
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef883a74e7---belamixovawaxadowizukog.pdfIn PDF document text
    • http://lokale-uzytkowe.pl/uploades/fckeditorfile/buvisixijuzewubaxemiwowu.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/ladilawe.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/25331928579.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/fiwowubevidevikureni.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/47735608572.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737ca9ab87a---76653795839.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/358fccdacfda0c928910911ce1a1a6f3/63394924797.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16080583a8a43b---56024123200.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/napenojodibasufowu.pdfIn PDF document text
    • https://tavio.ru/files/file/12372960616.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/4774d639bf95eb37e0bdad02d144c418/lelejo.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/latubutixakodowakuxemipek.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/92366980657.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/lufedokezujiziwoxanonuniv.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/bqhl34o4e47i95rm23lvr85t4t/loserefudosogofedif.pdfIn PDF document text
    • https://wineart.online/userfiles/file/naratodojibaja.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/9b5376882e30e28e38d32eda63b4d5c9/wujenowuwonijolirenu.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/nmimt94vv0odemkk3q7d3cosmm/57110376600.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/43039789994.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/m1jbnoopf29adk0c1esbnob3qn/gigela.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b11b33fb4---goturodolebijo.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/parokegajoga.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/vejobesanefuxageta.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606c835a3955a---fexuderugorejukofiwiwexa.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/95178400911.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/514d577c278a5560d0ebcc8521fd7974/jolodovekukukolowevunuw.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_off00010419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10419 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C30 11404 bytes
SHA-256: f5e3649023d650d5c2fafcad6d9f15bbb3087aad232edb7f476f056fe1dea809
font_02_sfnt_off0001360c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1360C 18416 bytes
SHA-256: 1c8b267458946241c3532981dcdef3b4abc366455533dda2d822917067e96b2f

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