Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcc6f7247c3f8034…

MALICIOUS

PDF

71.3 KB Created: 2021-07-21 01:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b775eef408a858af489aa9952da9f5ff SHA-1: aa8a316f68fee79b95ff9a563056d2303ddc71f2 SHA-256: fcc6f7247c3f80340dcc6b4fe8e4a3dce02e7186650c35b4151e8f31216d7821
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The PDF also functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. This suggests an attempt to lure users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://alice-immo.com/userfiles/file/veburijaxotedexobig.pdf In PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/kjbiv8lp6m4htvlldsa3ujs3j5/54118027448.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/a73e01a15c01601d7146078b4687dc64/jekugepog.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/fezixidigonozuxe.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/18469559412.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/68830579471.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607628abb13f1---69633707375.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/36868356593.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/70995756946.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607dae3b35614---28267591971.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/11806865709.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/82219873606.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/pinugudifuwomak.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160822aa4d4723---16986256730.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/badabenetakonuwa.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/fd46d892d040149eaa961461d2734b53/92880663818.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/71382788824.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/f12bfdceefc597437fd76871c174c0e6/89222317339.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/kowonuri.pdfIn PDF document text
    • http://inncredel.com/uploads/tigebunenosulig.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d4705245925---83420491783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=theory+of+relativity+download+pdfPDF link annotation
    • 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_off0000b55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55C 10656 bytes
SHA-256: c6642285c1845e777851194226e8f9f1580a58eccac4588f41eb4ef0004c27c4
font_01_sfnt_off0000cdc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC0 16304 bytes
SHA-256: faac55d7b847dba779acce139084a86ef31f43a677a10fa0a3f05048d9749002
font_02_sfnt_off0000f817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF817 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1