Malicious PDF — malware analysis report

Static analysis result for SHA-256 64f4567f056a22b9…

MALICIOUS

PDF

92.8 KB Created: 2021-06-10 00:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 07361c6bca043f2577699db2390fb079 SHA-1: 7d9086c483873df0f24a5c6b4c68a5f27f5a0a1e SHA-256: 64f4567f056a22b9daf3d2e705417a06af9c212f910631dff4d15346a2f226a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is classified as malicious by ML models and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to compromised domains, likely intended to redirect users to malicious content or phishing sites. The document body, though heavily obfuscated, suggests a lure related to educational worksheets, a common tactic for disguising malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=percentage+word+problems+worksheets+for+grade+7+pdf PDF link annotation
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/k4ueeqtpdfhj1s4jc8gi81j39q/76861521908.pdfIn PDF document text
    • http://beijingbeat.com/contents//files/damuki.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/51ab69883fb66089da86239770bf4bad/rovekilumiwasegafalage.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766ae39f82f---6286191850.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f175ea9a6c---dular.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160749a7b23e92---kogigafiwujanenifulefizaz.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5393a71b3---17907600165.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774fc3af782---84071920676.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/42832230053.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075781edbddf---fafamukiruramimux.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16079a409c62ad---60612444898.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/8a0173644ddf1f8ccf25870f3c0f3f51/tuvuxunopejelibemoxokig.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/jelixorodofim.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/542a8a424eb890b40b18c0f4e7612cf3/webuwiwinopi.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/zidugedezuvanuvu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C31 5944 bytes
SHA-256: 8e0fcb192ea2dfcefeb96aa7e1a19c63b82d161c6e1c0c469f0354a5f22c2f89
font_01_sfnt_off00014057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14057 11032 bytes
SHA-256: cc434e1f01b00906f3b872ed9e210e21c2ad7c6fa7bc52087ec5c43e86bc7671