Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f8db3b78834acb…

MALICIOUS

PDF

77.8 KB Created: 2021-09-20 01:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 126e5c5d17aa09f73bdb01bd37f9d1b6 SHA-1: bc7d884d2eea3270335243abe40157bddc403251 SHA-256: 81f8db3b78834acb571f7b4eb0f904633907424acbe953a0408d3ab95bdf6346
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely intended to lead users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://hometeamcorp.com/images/usr/39866813442.pdf In PDF document text
    • https://tanthueviet.vn/img_data/files/sopekimanurufibe.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/bekukexitamu.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/31816463391.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/c4e6532aabeb1e622b72869cb597bdfc/tuvivazow.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16136c8c827b1f---wagawu.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/90721467630.pdfIn PDF document text
    • http://cissi.it/userfiles/files/mosukezoxulumorilemevejip.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210909070651.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c524e1d94---darewafexuminefi.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/41895813462.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/dolaxukirosozorivimorepol.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e58ddc13cc---27059574024.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/widodanodigiropixo.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/zokututivikexu.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/jenegigakatadipunovegop.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/20827515763.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/kipetiminuzanufeme.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/deliwidabusuxasejovab.pdfIn PDF document text
    • http://exima.kr/userData/board/file/mabuxozi.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/jifamiwikifefiwililazora.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16130ebc62b2f2---vulotunizug.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/98223732446.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=hexadecimal+to+decimal+conversion+stepsPDF 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_off0000c8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CF 10836 bytes
SHA-256: 19dcf00af269a31c16b56b6fa6d7fd949749c9b2230897d5fc6499ea95219602
font_01_sfnt_off0000e1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B8 18444 bytes
SHA-256: 8789e2e20b4bc0b77440ae3f16bd943cc302722e98071988511eed40c4da6df1
font_02_sfnt_off000111e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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