Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a6455cb17b70e76…

MALICIOUS

PDF

71.1 KB Created: 2021-09-28 15:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 360fd2ad8a1d4fffd9f57b556911df6a SHA-1: db20fce9590caee0d3343ba540dc0e452b49bc7b SHA-256: 7a6455cb17b70e763830d681f527c9d2a87e2e724464f6df2b0928906bd2b811
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or facilitate further infection. The presence of embedded JS points to T1059.007, and the nature of the PDF suggests it was likely delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://phunhai.net/upload/files/rizuwemav.pdf In PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/rijoxusuzunimawedirar.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/daxamuzobogijivifulebave.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614f36d1aaf42---9100554235.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/14/kiruguderoju.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/80573010962.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/98861736487.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/zemofisasu.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/52180362462.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/94452644932.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/saxoduselosugamuw.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/9013562106.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/28910878300.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fc60a54fec---kovorowadikajujusozovavaf.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210923171625.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/40961705235.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/10870844068.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/79455163560.pdfIn PDF document text
    • http://fnathservices.com/upload/file/55577227188.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/80adt9f4gn6n32g1n7i8r8gpc3/83450593168.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614841cc628ab---89575510287.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/ruwojuxanafijegijovujusaj.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/84332922126.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/rebolodojegegobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+transfer+file+to+firestickPDF 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_off0000b3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AD 16732 bytes
SHA-256: 0afc5cf2f3a33ce1f140086a5a20999693b51e30fb0774639ec1a1dbc2afd1b5
font_01_sfnt_off0000de99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE99 10500 bytes
SHA-256: 8e68ce708a8254a9e2249956ee55041395b49327b99e7224fffc25b34199e421
font_02_sfnt_off0000f6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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