Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e76487faca087b…

MALICIOUS

PDF

80.6 KB Created: 2021-09-17 10:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 72fe02e013b2d6be251e919831b58924 SHA-1: ae43493b235cf07b8c5e2909286f75e1d91266ec SHA-256: c3e76487faca087b6dc2337c19c6b025ceeac1480b646b9d76fb7db6d24feec5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to various domains, many of which are hosted on disposable or compromised WordPress sites, suggesting a link farm designed to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs strongly suggest it's designed to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://twtipa.com/upfile/files/2021/09/03/36239392618.pdf In PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/90053174081.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/82215985532.pdfIn PDF document text
    • https://kermanrooz.com/img/files/93060156823.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/rapexaxerubolivenewunila.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138812e60ac1---monejugenogefujote.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130edd034750---52473476423.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/70028937075.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/9120855935.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/nanikovevefudozoxap.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/pobimunigaranunejawime.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/64042821953.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/17675449559.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/mofodikimapovubu.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/28512465092.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/11767324734.pdfIn PDF document text
    • http://gaudi.tw/upload/files/sijolaxafotub.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/letaluxamexalekaxetitope.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/novazonufowusozitabado.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210906224822_iuggfn.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/gasis.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/0ucs2iv89sb4bql2iknpb4am2a/19586928439.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613855a31cc50---24042242826.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/15094827548.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=jackie+chan+singingPDF 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_off0000d512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD512 10228 bytes
SHA-256: cacc35750bf8e7d0f1b1edfee80a0c1e247956133f5727c2e8bb09b2d300e032
font_01_sfnt_off0000ebfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFA 18844 bytes
SHA-256: 269f49ae47157400cdca0878c35a659dc7c85b15bd2c539c2fce289e33f90e59
font_02_sfnt_off00011ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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