Malicious PDF — malware analysis report

Static analysis result for SHA-256 80e6ab8043c0e233…

MALICIOUS

PDF

121.2 KB Created: 2021-09-07 12:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8f86f43f9968e2caef2d4292f640ecff SHA-1: de1667a69a7ce497918dd27bf2ba10d156d55347 SHA-256: 80e6ab8043c0e233e35e3a5ff5ba3d660b3582f856df827a5880b20e4c108ca5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to link farms, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure victims into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://auto826.com/uploads/files/zisaja.pdf In PDF document text
    • http://milsagliksen.org/upload/ckfinder/files/62849485107.pdfIn PDF document text
    • http://kme-kme.cz/files/file/vulomanuwepejoxume.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082b0afcf76e---jasowafobow.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/q9dm37sobpf9g72vp0depu6g2d/4045243189.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/36223435990.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077482d086c0---jofonaluziwaxalavutefiv.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/7bcf87bfda37c2330e0585a22b2f43b9/24407294761.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/79076d210b7fb0fe9ed2e0d8072c8b62/52773466653.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/xaluzinodekej.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/vutumabugaxubivi.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/xawusejosigedepunozonuso.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b0686eab45979fda4a383560c59f9baf/vopufowamaduruwawusut.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6324dc719---tiweju.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/20614486826.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210707231534_1577658437.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/e33d093e67dda8ef2b6b34080cf2e6db/85328881241.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/zagiguwirapefazakod.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/guxilupanogabanuxageb.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/26577007066.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b2be04497ae---76865266896.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609b55913aa54---44958147421.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/53975661527.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/23880211475.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/91903803859.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=discourses+on+livy+machiavelli+pdfPDF 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_off00017649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17649 11068 bytes
SHA-256: 914b10b63b169be24ab0acf2fc7d7d2d22e126d4ba8d7d01cb9d1c1ddb847ab4
font_01_sfnt_off00018fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7F0 18052 bytes
SHA-256: 30be68630bc29450d27726d5182ddd044aa3f6d7b7ef8cddb475f54a5c81c3de

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