Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9e026ebe7591b2c…

MALICIOUS

PDF

80.3 KB Created: 2021-09-19 01:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 47a9568abf085b4a7eab4f37ef456604 SHA-1: e1653f9b84aa4861b6576eca4928260b32105bc8 SHA-256: b9e026ebe7591b2c5773d2c1dcb70562967da73ada1c4b4e6065974ba6f376f5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://melodylavernebettencourt.com/media/file/77280206909.pdf In PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/99172615142.pdfIn PDF document text
    • http://birdwatching.sk/media/file/22018479169.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/94435220789.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210917191135.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/kilokukafuxinevage.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/37798122388.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161352c87e7ff3---48115764574.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/e9op7j0b18dk0qcgg4qqrnvlni/36443802325.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/xodixare.pdfIn PDF document text
    • http://konberdbio.com/upload/files/gurufetofodinavuxedi.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/63383399902.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/puwododuliw.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/21615986412.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/dojiladu.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/zidakupaxunawomevafi.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/bikunetonowofig.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/sowamenadupetagamimudoziz.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161445a4f713de---bekazojo.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210919065535.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/bewotososose.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/tetowadobeguwini.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=minecraft+mod+free+firePDF 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_off0000d089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD089 19892 bytes
SHA-256: 8730d5ab1514445d353fca22fdeca0808a62c9e4a3d48d69f879c485299f45a5
font_01_sfnt_off000103ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CA 10416 bytes
SHA-256: 21db6f8de8ddf75767ecc3336cb155a2f48647b18b5054b5281800e009350dd5
font_02_sfnt_off00011b5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1