Malicious PDF — malware analysis report

Static analysis result for SHA-256 a50305a7f5e6707a…

MALICIOUS

PDF

78.1 KB Created: 2021-10-03 08:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 507e160792d5c8f534879685685e9df6 SHA-1: a8b6073391f74c027f4538049bbc2c9acf9c5e31 SHA-256: a50305a7f5e6707ab5523a92eb3df6468b8f83c3a25c5c34f3bed3369104e038
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to numerous distinct hosts, many of which appear to be compromised or disposable. The embedded JavaScript and link farm suggest an attempt to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://wastran.ru/uplcv?utm_term=phones+using+type+c+charger PDF link annotation
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/30172312919.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/mopunuguwulajira.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/34459647444.pdfIn PDF document text
    • https://taxinamdinh.com/data/dulieu/files/vubesadetawakusugofupav.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/xosul.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/84494353099.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/78264412209.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/47988570538.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/57771417834.pdfIn PDF document text
    • https://lecachet.fr/docs/files/78541854929.pdfIn PDF document text
    • http://licausi.it/userfiles/files/31021961708.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9624ac533---72902681018.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/cfb7bf027f996ef559b7c93bebe5dfe9/72318176025.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/magalofi.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/duxivebegoma.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/maruzozizo.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/77911841786.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/73923399034.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/7k2q79ipeco5dkl28pmvtmuejf/7332236399.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/1j12uti0647bjhdfcohp7iv83p/85717240858.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/68821693591.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/6779098135.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_off0000bfb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CB 10820 bytes
SHA-256: 87db3b8553877a58f90f6a2e003d116c377a84e710ca74bf0df645887be11088
font_02_sfnt_off0000f0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C2 21728 bytes
SHA-256: 191665f871ee12e36f6425e13fdb44003234e9c76abca9fb71550c8ab7cc4dbe