Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaaa23a0932f54a8…

MALICIOUS

PDF

89.9 KB Created: 2021-09-05 12:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d00f80f9e6ea42ad81e7108fcc84f359 SHA-1: 734fded20b1db68467cc3a31fffc543eb0eabdd2 SHA-256: eaaa23a0932f54a804b8e4cbde5eb1715859dbf9d65783b421f421f43e6eddb3
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 part of link farms hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=adobe+illustrator+shortcuts+pdf PDF link annotation
    • https://zoldlepes.hu/userfiles/file/zubakazivafu.pdfIn PDF document text
    • http://hoskinspugs.net/clients/40498/File/38773535116.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edf35f2032d---pimuf.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/2719439662.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/zatesumik.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/81ebaa791e4822a5fd6010166036f36d/doraduvozojigonisodorarix.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c70f402c7ae---90361157487.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/63209473220.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e3a325793f---jerag.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/75816584762.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cebca65bfa---gesagekolajujelug.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/416ebd2728791351401bb04e7e5ebf35/86409718804.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/b809cf2a0efcb48831030b492294a34f/gaxarejomezatiziwivepe.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746f45b3ec8---74352739520.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f3ab1b144---negamez.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acd90a94d74---47768899472.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/33648371559.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/52117169714.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/jadonemerit.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/34919042347.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/79a9576604aa70ecf0cce4f96c7e8353/75980782294.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/jvqnl64biv4md2ar5p60qde42v/nakemebunipowoji.pdfIn PDF document text
    • https://seerupit.dk/assens/file/fipogopizavaboloku.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/24286617245.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/94120458745.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_off0000f731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF731 18624 bytes
SHA-256: e7fe05b62ff0afa47452bf2f5ebbb61917e46f8f157ee5716254831c42ce2661
font_01_sfnt_off0001285a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285A 10836 bytes
SHA-256: 4a4ddaaa9661bbc283c85365681724a788acc9b7fdef6bdeced0b92e65f6faff
font_02_sfnt_off00014149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14149 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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