Malicious PDF — malware analysis report

Static analysis result for SHA-256 c11c7efe59ec6554…

MALICIOUS

PDF

91.8 KB Created: 2021-06-27 12:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c43bfdbf9a85ecf2f2645ef1fce3d559 SHA-1: 7a9eaee45613ed847f3ad36fdf8963a29ec905c6 SHA-256: c11c7efe59ec65548dc24f2131315976192d4dcab160418c10dc93a778bad8e4
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to download and execute malicious payloads. Several external links point to compromised WordPress sites and disposable hosting, suggesting an attempt to host or distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab795b058fe---68138090944.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/e3f7205b28b60588ee4bdec92a3711d2/55805784667.pdf
    • http://qianlong99.org/ckfinder/userfiles/files/25500663885.pdf
    • https://arte-salon.ru/upload_picture/64515240212.pdf
    • http://qiuyutv.com/userfiles/files/20210608113014.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607718018aab5---dowisor.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089aff0e4681---3466724332.pdf
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/14658519334.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e35af196---82798655982.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/134c7ac8c4e3520a1e4179deaf75f2b0/16285469400.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/38rqdnnvdqa863bj4nal0jue23/favejud.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c1edc52833a---zodoribodazut.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/9c8322c1006f803b6a2769d277cbff23/27960154112.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/1rre6856n5airk2vu0nkrcr29v/pasemamojovokamibujisofa.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090ca6faf30e---pipenenageda.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/cd062bcd285a1110702eb596d13618ab/wamisurisixovu.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/kso5lmor5erla9v2uppnpcng6i/13361496379.pdf
    • https://mariellatriolo.it/public/file/suzor.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8b09977d0---beledapifuviriruwuselana.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/e8e22f0a9a2c887922956b571610b1ea/63732690254.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160986f335b284---rikolemuvuxewup.pdf
    • https://imad0c0.com/js/ckfinder/userfiles/files/8391595858.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/28d0e4217e6326f84b3a16b0ff0336a4/89574481535.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089890883038---depezaximel.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ce85e5d56---71305818514.pdf
    • http://changrung.com/ckfinder/userfiles/files/furanakevovumeraxemix.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c31c05d9672---85326510470.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=amendment+questions+and+answers
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010416.bin
5fb1896c0fba5dc8d070680d14bee0e95f3af6f5bd8e2afb7ad3b8c6270b1cc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10416 10676 bytes
font_01_sfnt_off00011c64.bin
3f74191456bb897f1ab215dcdcef29102a2d98215c607f450aa302af60a03c21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C64 17288 bytes
font_02_sfnt_off000149b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x149B6 16792 bytes

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