Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d9654eb40c14b96…

MALICIOUS

PDF

79.4 KB Created: 2021-09-19 18:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3f58e1a2561ad7aca0bcdd9167591014 SHA-1: 6474635c25a3eed0d3f4aa1883e7d062878701ae SHA-256: 0d9654eb40c14b962ccbd97724dbc64fccf1853204350ff5089eb19f7d56327d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains or compromised WordPress sites, indicating a phishing or redirection campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for credential harvesting or malware distribution.

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://drafthe.ru/uplcv?utm_term=halliday+book+pdf PDF link annotation
    • http://dralituncer.com/userfiles/file/66344783124.pdfIn PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/32626682510.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/5371vkqv4ecqb2ev3jfc4tk7ik/13953978835.pdfIn PDF document text
    • http://kesifveotesi.com/files/sexuzowawulizululigovo.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/bigeko.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/6c3e94a9f922f475423451cc0d11ff4e/62871017098.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142806f25440---pabixobesajugezovuk.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/43922112719.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ff3529f4c---dipujof.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/vebudekake.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/vatogezelokutonanav.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/fufavezotojagafod.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/zowobusufakefafow.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/wepox.pdfIn PDF document text
    • https://aedwea.com/upload/foto/25867398500.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/95543872764.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/90285401947.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/nawudi.pdfIn PDF document text
    • https://seikai.jp/free_images/files/botegoziwali.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/dovurajeseremikubusufiwuk.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/4nsgeaei0prsk3av67t81q3rc2/55542989928.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_off0000d460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD460 17480 bytes
SHA-256: 23d4247b563a29886cc93a5ed96453a6bf9d1b41740bb3c514fa60d349af02a1
font_01_sfnt_off000101c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C0 10224 bytes
SHA-256: be697b1c9ea076d7c1b44c54c378edfcc4b8559099a8de296f12a104554c1048
font_02_sfnt_off0001187c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1