Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d4e83a71c72e0a…

MALICIOUS

PDF

71.0 KB Created: 2021-10-01 04:35:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2cd6f248a526a581902b68dd31700659 SHA-1: 10729c42bf7e1cfb67cc2f90bdf10635263cde39 SHA-256: a8d4e83a71c72e0af2c2d7a82b922d739538e7f038f4b28875645e92e25f750a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://crysiq.ru/uplcv?utm_term=new+mha+movie+2021 PDF link annotation
    • http://stevis.cz/files/file/vofikadafujabevodiluma.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/6654514713.pdfIn PDF document text
    • http://fulico.com/v15/Upload/file/2021924321476630.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/16979384385.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/sujulo.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134715bdb967---xerufeki.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/tunoraxotafalarino.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sotugupovumimi.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/litotozebi.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/72962541275.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/11483605518.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161557f7e4348b---nutokosazoroxiwilimozaba.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc414b1067---14835537248.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/54847829869.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/latafovegewetomowi.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/34900357320.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/19113063826.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109102028112425.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/wevuluzinasaguroxogo.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/fosugogezufonufij.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/porupobuzozami.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109301655548924.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/6a6d1d4e599720f83b953d1cc9c5c666/90361409950.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/63957264625.pdfIn PDF document text
    • http://fruitsad.pl/images/file/nonotofozonomuwemopedod.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/1445374011.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/97331739381.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_off0000b6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6DA 10280 bytes
SHA-256: 940e689167343cb4987a79c7bc53709c6e80d2eb685d4309b1802859ba528c90
font_01_sfnt_off0000ce16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE16 15796 bytes
SHA-256: 8a1bf9905963eeeff265dfa52fae0bb45f2db2e93b31fd19c48891e355575773
font_02_sfnt_off0000f647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF647 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.