Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c58b39431caa1d7…

MALICIOUS

PDF

75.1 KB Created: 2021-09-16 04:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9da3fb278612d568ba63dc3a8273ed86 SHA-1: 1c2fc2e8e79b414ee736161a1c46d070433ac29b SHA-256: 0c58b39431caa1d70907f8080294df7e3b854377bd1071c4f9eb1f63440f95cf
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 a link farm hosted on compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=black+panther+watch+movie+online+free PDF link annotation
    • http://textingrights.com/userfiles/files/54451244806.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/zepijepuxeruvolodopom.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/lasusotem.pdfIn PDF document text
    • http://workontext.ru/media/file/77109503624.pdfIn PDF document text
    • http://rs-entp.com/upload/file/26943315772.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/vanusamuxeka.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16139391467aaa---86436868840.pdfIn PDF document text
    • http://crm333.com/documentos/file/kaxugonetemes.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/jelowuxufaxasedawi.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/37152472569.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebc6f1bc2a---28817934276.pdfIn PDF document text
    • http://analhospital.net/file/files/gikew.pdfIn PDF document text
    • http://jeanchapleau.com/userfiles/file/noragitoranevepexad.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/39557868644.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402fc3e5c84---wanowekotenisanugud.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427f594ca4b---15979891971.pdfIn PDF document text
    • https://clubon.top/uploads/files/gonej.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90634290402.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/75893330086.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/12539205992.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613efe90daaf3---xakasoraribujolupupetag.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130a3af74711---27428871539.pdfIn PDF document text
    • https://attack.lt/images/files/rokopepusalavopiwibab.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/sevotodupifasovufipedub.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/14021315645.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_off0000bffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFD 17792 bytes
SHA-256: e001e856480af7b952cf4b15ebaa74b77eeeececa9f9267aec1055d6253051b5
font_01_sfnt_off0000edda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F1 10872 bytes
SHA-256: 178bf44b5307c7253d9c8e8a9adfe3122cfdce6b387fc8705efa2b2156c332b8