Malicious PDF — malware analysis report

Static analysis result for SHA-256 d235ee9e25eb08cf…

MALICIOUS

PDF

81.4 KB Created: 2021-09-04 03:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a826cf7e34e4f88e2b50a1110d24e766 SHA-1: 168571e9c4b27d1f85f2ce28fdd04924f61c06fb SHA-256: d235ee9e25eb08cf94fc470e3eee3bb2129c5cf719c6aec611a3055a84ef3820
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS upload directories, suggesting it functions as a link farm for phishing or malware distribution. The embedded URLs and the nature of the heuristics point towards a phishing or credential harvesting campaign disguised as a document download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/48469d1e136a8e7a231be502f8210937/xelajoko.pdf In PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/fc1e355bf51039c186bafafd13c1a9b5/27084366201.pdfIn PDF document text
    • http://nccutrackandfieldalumniandfriends.com/clients/2/2c/2cea5a7e730406ee40dfbbde6098010c/File/48944853562.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/81543922253.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/nefisakowabavag.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/bc771c6882d4bf782583d4a30333d5ed/36816705925.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/26484044377.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867fd374eb8---toxuborogowutukide.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/pitoguwudivazudig.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/lekapejuzevovalur.pdfIn PDF document text
    • https://magerp.org/upload/files/55827919983.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/168575cff005d6e8f370d49e74d4b760/51807521947.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/mitebotogepido.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/58551369203.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/jovodegatemumerivokakovi.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-6-11/20210611090407980686.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/34923347988.pdfIn PDF document text
    • https://mauspro.net/upload/files/44778552270.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ed8033881---wofedurajumev.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/51024633886.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/a1acr2njb3rq7u25h9bisklhip/dasitofafubanunum.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b592e8bcc18---68468395312.pdfIn PDF document text
    • http://htwy.com/upload/file/lidadunifubitipawugirapos.pdfIn PDF document text
    • http://littlefreddieking.com/clients/65037/File/kodopalorigajudu.pdfIn PDF document text
    • http://douzonebnf.com/upload/file///64937749027.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/17681011273.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=singer+sewing+machine+manual+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_off0000d8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FD 17848 bytes
SHA-256: 05c119f0f4edd244e0e8ea98e3dda1434d0932efef9a993b1246766eed0234a7
font_01_sfnt_off0001065c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065C 11108 bytes
SHA-256: c534aae880fa34e2a82ecf13c177bc52b8a142a3445be02b78ff424fd2d23fee
font_02_sfnt_off00011fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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