Malicious PDF — malware analysis report

Static analysis result for SHA-256 96c67a34f88c2aa5…

MALICIOUS

PDF

82.8 KB Created: 2021-10-08 05:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0fe251550729f28af89779fa4b35db3a SHA-1: 7ea93fba2703789051d415e551adb82505d54eae SHA-256: 96c67a34f88c2aa5663e032856a07912a251eaa48313776fefebb777718f0573
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the PDF is designed to redirect users to potentially harmful content. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://laborke.ru/uplcv?utm_term=cub+scout+leader+how+to+book+pdf PDF link annotation
    • http://adriennemason.com/assets/files/35792956328.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/56404348143.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202109021241288165.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/sqh0acaltfje1bhjqspttvek3l/76389598814.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/18750672522.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/ximaxovugotukilobotizu.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/visixodipirafevedakor.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/furumasezibezowoturus.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1614590fba4357---mutokunekabakapiv.pdfIn PDF document text
    • https://harmony.im/userfiles/file/85802776438.pdfIn PDF document text
    • http://safarang.com/basefile/files/48499846338.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/bekiteka.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/15820676384.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/xadebutatifokorisi.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/78331259046.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/6b1509fd5ad920c8da9ac67758e5d8a7/44453748999.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/56100809061.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/53245990695.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfccdbfb6c---jilabodomulizu.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/saninugujugume.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20211001_22648B6634411BCC.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_off0000df0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71D 17348 bytes
SHA-256: f152aa8d0beb959f8fc436a103331c2164142cd2ea6d904a83d21cbfbecff23c
font_02_sfnt_off000123e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E0 10968 bytes
SHA-256: b625cf53157c434000def432ecc84a495e8eda1881ae6b865164c7be4426a0e6

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