Malicious PDF — malware analysis report

Static analysis result for SHA-256 afcd03222aa5a4b7…

MALICIOUS

PDF

91.9 KB Created: 2021-09-13 17:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: acd74770e6bcab93640f79bb80a3acbb SHA-1: e0705ad942b2292263e9d01428c67d1d00352d9c SHA-256: afcd03222aa5a4b77f42f7aa3b98e0c2459d3d4fe9ab4ace99a7cf0e96324072
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript (T1059.007) suggests it may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c605dd559---kuwinisigan.pdf In PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161319c1f696c1---benujabudepafabifej.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/41220813274.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/25472526944.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/baxukelumesuwebakiwom.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/18986994153.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/57560853112.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/wuwufibesat.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/dalugi.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/13004302194.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/mekopojurid.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/99442717968.pdfIn PDF document text
    • https://nistd.in/userfiles/file/92837608182.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/93242198550.pdfIn PDF document text
    • http://sieuthibds.net/images/files/38401974880.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/juludakaket.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613da7b74e9bd---duzewozeredagaxek.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/bisebuvobisodivelu.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcc5d0641f---bemikofovadozu.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/rugelutezopoloxogani.pdfIn PDF document text
    • http://mkontakt.pl/dat/file/96461031729.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/maxividetusojajuvibi.pdfIn PDF document text
    • http://qwerty.pl/_data/file/77328962454.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/69975648027.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=redmi+9t+call+recorderPDF 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_off0000fe3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3A 19652 bytes
SHA-256: 2f0936d2253b5ff7e8d27ebeeae5a5a5b810b5d52f32b197b02fb57428019129
font_01_sfnt_off00013235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13235 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A4C 10472 bytes
SHA-256: 5fadfd9c5ead95110dbccf88f804c1ef19ef26a0d9bd9bbdbe703f1e7597dfcd

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