Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cadd8ff24f62e23…

MALICIOUS

PDF

74.9 KB Created: 2021-09-07 05:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0c8cd452bde4a5a963ac06c69f2d7bd6 SHA-1: 39740d81f36a8a3cf027a9b3139bdf79662d60ae SHA-256: 0cadd8ff24f62e237a339ede68df98516961e213cbafb1e6b0532d7b9dc1defc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=budgeting+worksheets+for+middle+school PDF link annotation
    • http://bezagsecurity.cz/userfiles/kigasunuverisipediwub.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/c1eshuiav9b4u38ia6h9gkgt57/24821474284.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fb4ad61ddf964ddf4ccabb46c3874d6b/65219258965.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe3a8e74b5---51757977895.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88d754904a---dujejozowuwipo.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/mesos.pdfIn PDF document text
    • http://ks-puyuma.com/CKEdit/upload/files/lizavaw.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610544f0da657---44374474706.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f9f174b9c09---zigojixefujoxiviwawonaw.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160979997ba40e---pokavulawa.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/l4j8r0h3eciougs0anobauu772/sikejelonaw.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/mifuserepan.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/1067556154.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210812080116.pdfIn PDF document text
    • http://355353.ru/userfiles/file/vavirawupojinunegok.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2d806112b---vuzajiso.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/gafiworefalubivofe.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3aaefdb36a---jijami.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69f8a7adbb---4420958271.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/32256694643.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1d19796b4---87717482501.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/kokebikobajasuv.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/63312461957.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/86509031919.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3a74cc557---poniselusunelubumizujeva.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/4bd72b57a2cbc5152fca50d4ec9241e8/tawiwavelusedifatudiri.pdfIn PDF document text
    • http://gz-gm.com/uploadfile/files/20210820_153828.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c102ffba6c9---firokakamup.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_off0000c30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC30F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB21 15924 bytes
SHA-256: 474100ef50cc382b3a66e21c1de7a89d55e7237b63b3755352eb11d1e1a2cb29
font_02_sfnt_off000103af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AF 11092 bytes
SHA-256: 6fe5964b2010c3449c928c21509adc8be432ffc1d4b44523c0a3931b380d109a

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