Malicious PDF — malware analysis report

Static analysis result for SHA-256 c34bae2f6aa53ea3…

MALICIOUS

PDF

74.2 KB Created: 2021-09-21 13:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2b242f1182e77d2ac37bacd2d34669d4 SHA-1: 8b490625f32262f1f765ab1fc8c31c4bcb049c3e SHA-256: c34bae2f6aa53ea3097064694f97bf524f6955317d2ad600d056f7a01478f639
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or redirection to malware. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure designed to trick users into clicking through to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://studiolauramoschini.it/userfiles/files/48693648292.pdf In PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136655da7dcf---63578164910.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/kovulajavutajavutusefokit.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/kukebabi.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/kezuw.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/gimilivitivenanobo.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/natesuvize.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/19894303357.pdfIn PDF document text
    • http://104408017.linker.tw/files/49996326294.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/jeritadizawowavagibapap.pdfIn PDF document text
    • http://ptk-tent.ru/userfiles/file/zorojixule.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/voliwoworilavalutosudoxes.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613649fab8b03---76781213440.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/gobebitexo.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/domigafaf.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/tefiw.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/1278b3c04124d1ae1e7e3b204c386cb7/rofuzulepofojavojejav.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/20699667806.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/20963169656140753742546.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210911141111.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/b6321ccdd962d680d6c61021ef92d5fc/pabaru.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/39841669917.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd3fa353dd---fonapawefofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=comparatives+and+superlatives+exercises+resueltosPDF 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_off0000ba99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA99 10972 bytes
SHA-256: 7506da986a3bd37ee1596a10a860fe7e9472e218ff6ac13350e53f12068c754f
font_01_sfnt_off0000d418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD418 17992 bytes
SHA-256: 1760bb227b2b2e967e811056483f78bb96216248f16a2afe4d48ebea16b16f97
font_02_sfnt_off00010275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10275 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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