Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f0b1eed0e39a722…

MALICIOUS

PDF

81.7 KB Created: 2021-09-11 08:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c44db000425870e54c867ac630e38fd3 SHA-1: dcc6f85f42f02d53459fc833e0b4310880451d8d SHA-256: 9f0b1eed0e39a722f235c781e256889de43f1db1ac3d439e8550810bc9125b23
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves leveraging these links to potentially distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=how+to+set+default+storage+as+memory+card+in+android PDF link annotation
    • http://wacommerce.net/home/integrity/public_html/ckfinder/userfiles/files/woteg.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/5368132482.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/97e210d88b8c0afe97fa77f029161552/36785674455.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/nikidaxusiwo.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/3c098773bea82965a9be23f68fc02262/xigipom.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/boludet.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/rosopuxepudutobojixu.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/31032636043.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf0e1afa0a---pujalazu.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210908_1EA24A44F6479F56.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/vivixixojizulowitokogiku.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16135820c4ac43---fovikomapireritoxemug.pdfIn PDF document text
    • https://melz-feu.ru/upload/zalewitakikabibifibugu.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/tezozibitegune.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/sedava.pdfIn PDF document text
    • http://i-tos.com/userData/board/file/rekuzoxupobofalem.pdfIn PDF document text
    • http://www.travelwithtaangoo.com/img/file/13018245074.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/7ndlh7ia1b5vkqn0sv9jdr07f8/92698308714.pdfIn PDF document text
    • http://quesnelfoundation.ca/userfiles/file/dewudukugozaxedapujag.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/48625629851.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/mizaxebum.pdfIn PDF document text
    • 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_off0000d88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88F 11112 bytes
SHA-256: 57913494f437fd935f24944db33eb9d8520b6e7e93e8412fd9697d69f46d8676
font_01_sfnt_off0000f254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF254 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A66 18084 bytes
SHA-256: 8b691ae57bbd5f97403f571cb061457f840511784a4ea5afdfe17075bf6f6e08

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