Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a2a0c6e2f3cb73…

MALICIOUS

PDF

77.2 KB Created: 2021-09-09 23:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0eeabd8fe394def8ced23813b5cc121e SHA-1: cf64f05e5ff9a7b5206deddf8a1c0d2da743117d SHA-256: a8a2a0c6e2f3cb73d581e699691320c57f9d33ae3f48d8069da9974b33d93a2f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on potentially untrusted domains, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • 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://watfordfairtrade.org/app/webroot/img/files/jenodin.pdf In PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/28396658525.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/72630646479.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/jerasisajaropobobofaxatam.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/wetepoxefek.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/niludawe.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/bemegajabujawewunusej.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/36115681398.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/88901790946.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/27532979378.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a65a9ddfca---tubupanolosigipufuzux.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/43784527804.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/89833601905.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/jenebave.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/81871572742.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/58400226447.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/9326820479.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/vapufotadunuwame.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/9172717693.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/beb1e78c6ed92fc95fee6f6649b5ea34/81853668614.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/wapisidudagedadovoxaxopas.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/kdhn04er7f21mkcn6kk5oc5ns8/68742783047.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613291cb4d806---174502380.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+draw+mewtwoPDF 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_off0000c8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FD 18580 bytes
SHA-256: ede3f8ceadc18511807ad2968814850c22667aaf1a4754c62c9f584ebd65cc58
font_01_sfnt_off0000f968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF968 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001117f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117F 10076 bytes
SHA-256: d9ad0365eaae8d0d15cc2abb604fa987801cd2e7d85a33aa457c0c48a7755dce