Malicious PDF — malware analysis report

Static analysis result for SHA-256 96b02e90af3c1147…

MALICIOUS

PDF

70.2 KB Created: 2021-09-30 10:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ea6d93339d1793a216b65de3ce0ddf25 SHA-1: 1bac024a12263beaa6d905825faf92c90a6b82e9 SHA-256: 96b02e90af3c11475e114145c2ad591e78cff36d49e0ec0c6932f4c3944ab045
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to various domains, some of which appear to be compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://honeycontacts.com/uploades/userfiles/file/fekumojuri.pdf In PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/531d069a3a3bed17a0bbb61633fdddaa/gupegak.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/todarutiwuwafiwaziked.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/7fb9725f26e553572e5a7ad7c53aa792/pikusujefumate.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/98925942226.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/52522581803.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/24651237821.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/matipusajej.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/sofebetezarowazugamezarim.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/38007881863.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/zubobuwotirefoji.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/6153094524.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/dukupe.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109151257018603.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/17341089604.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/29032731755.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/95976721988.pdfIn PDF document text
    • https://hssanesteban.cl/files/nejoduwopiveletotofep.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/81461629888.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fac1185ab---60284638599.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/14371427809.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613954f924546---96227844049.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/getin.pdfIn PDF document text
    • https://hotlinepro.in/admin/userfiles/file/sazujifuponipifobiwupofe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=tekken+2+game+download+for+android+mobile9PDF 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_off0000b023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB023 15696 bytes
SHA-256: 69fd2c565872aa91e7ca6e50541933fab1e3c7564a58c5c27f6c678da5a5fb08
font_01_sfnt_off0000d7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000effb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFB 11000 bytes
SHA-256: 29b2026478326fae4a6c90842fd64cc82dfef02b01d6b888170f36e50aeb1dcc

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