Malicious PDF — malware analysis report

Static analysis result for SHA-256 e71d351a5f6f868c…

MALICIOUS

PDF

98.1 KB Created: 2021-09-20 05:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a78b59e32ab85e53db19455974303010 SHA-1: 8b9cc62d1ac055ce6fbcb7b75eb4c9b7c3a68bbd SHA-256: e71d351a5f6f868c8360e1d391aab640baddff88f6f3753d41d1223c7e8c32e5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. Heuristics indicate it's part of a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely attempts to download and execute a second-stage payload from one of the listed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://coretry.ru/uplcv?utm_term=upper+esophageal+sphincter+problems PDF link annotation
    • http://magnumprint.ru/upload/files/meripetizoxugodalowawipuf.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/dimubipibadurumobosijo.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/60127012945.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/59176742932.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/8714586244.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/10289270217.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/48768197764.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/nomitud.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/jukavubuxotefedax.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613175be24fa9---givodevotobawo.pdfIn PDF document text
    • https://maffart-guy.com/userfiles/file/nemeximiwopokor.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/zebufu.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a6ebee905---nirakosimujuropuv.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130045d65ff5---zopeduraval.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614384f615e57---dewotanuwosuku.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/xadaxe.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/32474971741.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/junaditukinorolofifumuluz.pdfIn PDF document text
    • http://labsshop.com/d/files/5072640289.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/51108532600.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/fajuzedexadukujakederex.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161368ead52cef---jarejekama.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/70729301014.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/84981659535.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145525eb409f---taguzoxezojemi.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_off0001182f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13046 10968 bytes
SHA-256: bb52ea98436d36395b894f73de3aecf542d74218b22eeb693cb6d5c74110e5ab
font_02_sfnt_off0001494e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1494E 18924 bytes
SHA-256: c8f78dba351b9b88197ba5e84581b93038d443272cf38b50f005605f7ef286bd

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