Malicious PDF — malware analysis report

Static analysis result for SHA-256 87cfb63679c3ae84…

MALICIOUS

PDF

102.0 KB Created: 2021-08-11 22:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06c70065864d38c8b2aaa4bdd7399990 SHA-1: 9fbe6dc3abd95f5265e6de96a096cf88456e8acc SHA-256: 87cfb63679c3ae84f12c03d3c204d61f09cf94d476ff0412128a8a7d6e956079
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains embedded JavaScript and numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The presence of embedded JavaScript suggests it may be used to exploit vulnerabilities or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/399a737b51e78693ceac22dc57b3a966/rutido.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be156c82e9f---53611406150.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/4f512e5106555331763dc5b960755eef/54644562016.pdf
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/fuvegugozabafibufi.pdf
    • https://beysukonaklari.com/ckfinder/userfiles/files/fexewipoxodawajedirek.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095203ca35ba---16945244886.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607edf8f818e2---zutupotaxofixikibobo.pdf
    • http://clean-ecology.com/Upload/files/48077478918.pdf
    • https://doxity.ro/ckfinder/userfiles/files/sesavawomopil.pdf
    • http://deshdunya.com/blogimage/file/59978141726.pdf
    • http://meandnetworking.com/ckfinder/userfiles/files/kerizima.pdf
    • https://ascii.tn/web/cgi/file/lirekaburerolowes.pdf
    • http://www.moyekolodin.com/files/xesadotikafaxe.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088fd8dc0c91---vepakenara.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868c431e44d---korig.pdf
    • https://nepalipublisher.com/ckfinder/userfiles/files/dolina.pdf
    • https://rijst.nu/userfiles/file/98137749713.pdf
    • http://allamericannursing.com/userfiles/file/bumini.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/nb5oitljt8sslgaf2vs71l6p1a/nidubukijevo.pdf
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/96234981083.pdf
    • http://castrolmintabolt.hu/images/upload/file/14306920834.pdf
    • http://mitroc.com/userfiles/file/kakelepumomum.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=n%C3%BAmeros+mayas+del+1+al+10000+completos
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107e7.bin
93a2c2ea3c7da5dc3043a5953127bedffd07142b9697c362ea4429366fb6af8d
pdf-font-stream PDF embedded font (sfnt) at offset 0x107E7 10860 bytes
font_01_sfnt_off00012127.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12127 16792 bytes
font_02_sfnt_off00013939.bin
4d03ff961d0c11fbd0db410e0c09d5b5aa3e8d674f22896eca146609570dc3a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x13939 18896 bytes
font_03_sfnt_off000169a4.bin
6cdff153944515529e41d184eb65c7d096443c5033d8fa491092dae9fae8d55f
pdf-font-stream PDF embedded font (sfnt) at offset 0x169A4 18512 bytes