Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f4dfcc8e163605a…

MALICIOUS

PDF

88.5 KB Created: 2021-09-16 19:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b4911500de950080bc32464369710080 SHA-1: d217092cbb41932ae5563a5db2f37f4c1368bb5e SHA-256: 6f4dfcc8e163605a325f8766e3cb5974f568e12f9854b0b8d766f71c40e1fed0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, but the structure and URL analysis point to a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 http://uptownchantilly.com/uploads/files/jopufomegojekepazidefika.pdf In PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/7f91fcb3f40676d6c7b685def59f022d/guvevosatukupufelofow.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109090838403071.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/d11084556d6788106f6fd200ccbe3245/fegujavagonibejonofami.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/t2u1tk4o91fgcbqnuh0bmr9td3/voxezasepomubazubisu.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/gesonoju.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/70348072747.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/lezefixosado.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133b2c725b50---57934011682.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/0f5f27d40d5bd40f6dfbf227b31ba9d6/dizavesobozojoxofasok.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/26899119385.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/23460906868.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/75370589599.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/48735213706.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/3920401383.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021091104485070554.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/41684452346.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/navirasiwun.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/gopomuneke.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/kekujek.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/pifobotud.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/patexixugoj.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/zemitiludabefep.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210914_E69714BA532ED855.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/43996797298.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/54028473342.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/kelawunexobag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=365+full+moviePDF 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_off0000ef9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B3 10284 bytes
SHA-256: 24ce32ea8ef67f13c56f6f2d67d5fb7b79054634592b44f2fd82e90f052b448e
font_02_sfnt_off00011ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE6 20652 bytes
SHA-256: 3a9af80964bffb978972309a8a7fb2d8efa82359a8217b1603106274f5f52fa8

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