Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a923683104f67c1…

MALICIOUS

PDF

85.7 KB Created: 2021-09-21 04:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5bd3ec02d80e8bb367f4680961e03097 SHA-1: 7f7bd6f42f40e907541bca517eaa49c8431da7eb SHA-256: 5a923683104f67c17e59ce64e1a35984a2dbaa54c80ed2ac426e65786f7cc9d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bbfederico2.net/userfiles/file/jerujalezo.pdf In PDF document text
    • https://happen.webasl.com/userfiles/file/86252869181.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/92357980020.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/zesaxuguforefop.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/tenuwosepakewa.pdfIn PDF document text
    • https://yodobashi-church.com/romiturofolagogurivudi.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/fenufijopapelukisivuzi.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/wajapolutaxelexovoz.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/64440816262.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/xorabuvatojixoba.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/46920917585.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/fiwivebilimibepamuzidu.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/suxuvarurak.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6b9232acf---39006336342.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/senenuzesidifepirakuw.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/29827461522.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/zulifudaferuse.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210902_AFFBE74C2E41886D.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/zoxawidodekanokowitat.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/genekefuwabi.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/44000888298.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/11132224808.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613db4c6ea96e---65532414675.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbd4273d90---ranefupoginamirupope.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=goku+first+time+super+saiyanPDF 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_off0000e7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEC 17856 bytes
SHA-256: 9660696b814b1024b06dd861c66dafe4f31e208a85d567fd06e2b8e0053b5640
font_02_sfnt_off00012e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E88 10816 bytes
SHA-256: bbf230bbd7c1e33d5d9db7b31be026d0b17f731097ad5423f41fc9f3ac8031a7

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