Malicious PDF — malware analysis report

Static analysis result for SHA-256 8600da2af1cb937d…

MALICIOUS

PDF

80.6 KB Created: 2021-09-18 18:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b70233705c480ebbea50e2743b4eac36 SHA-1: b8b792aff5a4a55efdd88084ce83f71ebe7727ed SHA-256: 8600da2af1cb937d1130f0563a85a31a99f3ca10fa5238033c8a5681ea1a3b4b
164 Risk Score

Malware Insights

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

The sample is a PDF file containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities. The heuristics indicate that the PDF contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161319a6962c52---76829750989.pdf In PDF document text
    • https://goldmenu.com/userfiles/file/96740378950.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109110201414406.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161367b2d06f34---difudowojutomolesoroso.pdfIn PDF document text
    • https://ccichn.vn/data/upload/file/84483602207.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/33716894479.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/tililuruxi.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/5756209674.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/vuvusomud.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/24604309902.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/raxiduvotikuzasikivux.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/jatulofigedugatifuzi.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/16627685167.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161346b7129c93---83499833017.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/27997994180.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/likedoguxuxavu.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/89341106837.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/18520821150.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/fawami.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/zinifolege.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/sejuvugigaduminov.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/suvagata.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/85775111341.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=blastup+free+followersPDF 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_off0000d6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0B 10396 bytes
SHA-256: 667f29c57dded1a8fcd8c39d24589176e5f97a2270b931be96657f50db3bf3ed
font_02_sfnt_off000106da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DA 17892 bytes
SHA-256: abec27c88bf26cffaa401a42f894863d78cc937ac1767b27aaace661a3327238

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