Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b14d138ae0fca92…

MALICIOUS

PDF

73.0 KB Created: 2021-09-10 04:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cfdcb855ad30474514ab71a67f78af4c SHA-1: 39046b7e0c674ac9c69d5d792ecdae5ff9f7d0bf SHA-256: 9b14d138ae0fca9236a5a61184e5bf7220fcfabf528a1a27c7473fc682f452bd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The numerous external URLs, including those hosted on compromised CMS uploads and disposable domains, suggest a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pixomot.ru/uplcv?utm_term=clear+notification+on+click+android PDF link annotation
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210909085955.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/xigekoxuxetowatufiwaje.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/wapajuzutodesul.pdfIn PDF document text
    • http://skncn.com/u/files/xapute.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/63267198306.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/10233631716.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/44236264902.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/xisagisejuv.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/22306063789.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/43745756780.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/zununiniveme.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/71235873876.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/d5971366deb7fa7c6bc111916f832a7c/4879622717.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/65676423132.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/ruwuxukozowo.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109091715319753.pdfIn PDF document text
    • http://askort.pl/Upload/file/zefofoparivalukogozebe.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161305157ab11e---82532499953.pdfIn PDF document text
    • https://basisangka.com/contents/files/bumawujenofige.pdfIn PDF document text
    • https://okazionche.com/files/bikakobepokijaxitolifugom.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bc1545d7d195276e1ca3d9ce22048b7e/17837007901.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/2175277861347718bb77c.pdfIn PDF document text
    • http://a-pro-peau.fr/userfiles/file/33541716812.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_off0000bb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34D 16696 bytes
SHA-256: 8bc5f16934bd8625cb2221809d9716f25c7934d169718176db0b42ff71f04109
font_02_sfnt_off0000fe8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8F 10424 bytes
SHA-256: bdff69128afdf63d994ea0a4173fc64a2f80559f35f1c11f9fa0626630579b42

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