Malicious PDF — malware analysis report

Static analysis result for SHA-256 28852c244d314ac3…

MALICIOUS

PDF

101.7 KB Created: 2021-09-18 12:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e45123c7b9817dc892f7820a0a202547 SHA-1: 32efc14139ce995c931368a0aaf121939c12474a SHA-256: 28852c244d314ac3a379ee8cf85ecdeff591a317bc881ebfa956ee0ddf82eb30
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common method for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://philabc.ru/uplcv?utm_term=how+to+rotate+photo+android PDF link annotation
    • http://pazzo.jp/js/upload/files/mekirukusoguv.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/nokibawapopejojav.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/28c156a6199a54f0ce27342ba8e39964/puwubezefuru.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/52418602175.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/koladopoxutigogedumukol.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/wubixibizukibewiguluzof.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/rapemuzibajiwazesepemovi.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/85093984817.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///7651660983.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143ded8e4b65---gowovulozowunenelujoravo.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/funinikedipufe.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/4763002180.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/274844d886be47e589e3c901d37fdd10/63554987038.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/35961463996.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/34967036674.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/nurorapuvanasew.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021090107252783.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/7039381730.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/lizufoki.pdfIn PDF document text
    • http://bluebossa.pl/files/file/fifogodomubizadu.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16144993e55dc4---tezikedurepiz.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/birawetoli.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/xipufodabegizavo.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_off00012761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12761 19332 bytes
SHA-256: 30396a242e09e56d69d1447635f2d69f7f3ef8a68eb420a519c60a798a84ae6c
font_01_sfnt_off000159b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000171cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171CC 10352 bytes
SHA-256: b5f41e0ce8b3a40b06b302bfd5b6356762d6ea38e339f09b7b95fb0f35b4ad0a

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