Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5b869ee5c37e9f…

MALICIOUS

PDF

77.2 KB Created: 2021-09-13 06:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bd87070146e7271d6e3f0bedef944510 SHA-1: bd186f7f06bc0cc40777c6732ee784aaa43c11c9 SHA-256: de5b869ee5c37e9f5514ca2fb7449f1c40fc22e71ecced8b1aa2ac5363d3dee3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous links pointing to potentially malicious content, including a link farm hosted on compromised WordPress sites and disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a phishing or trojan payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • 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://infrive.ru/uplcv?utm_term=bike+rivals+mod+apk+unlimited+money+free+download PDF link annotation
    • http://badgerhillfarm.uk/39529820252.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/fowej.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/jonegoruleveras.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/jk1kheb23djj77kgi1j61r1ekd/66996360933.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/92501559810.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/sadapij.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/pofarajum.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/moxunawitetisowizubeba.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/rejovexulelozejun.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021090614574773499.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/44c63ced32505069457165ef1f3b7d5a/65211174273.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/67f1j68u0gaaesc22pa82br6r0/javejabi.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/32429905167.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613916c51c29a---nesozetakofafe.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/zelegotizavobim.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/2431730892.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/44880210572.pdfIn PDF document text
    • http://osayit.com/images/file/47030590656.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/roredidezotilakidujo.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/2487216520.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/lenamosixumija.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/66627863789.pdfIn PDF document text
    • https://il-gusto.com/images/file/moboligobo.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_off0000c7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF8 11168 bytes
SHA-256: 277fa3ef0bd6b12d676e9a38b963bd3b1acc7a7f65294c7a1177a6ffdcddca11
font_02_sfnt_off0000fa24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA24 17152 bytes
SHA-256: 5ad6605cb90d0bdab2410ab0dba4d823f2307095b0504b4c3225e790731e3420

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