Malicious PDF — malware analysis report

Static analysis result for SHA-256 f63fcc9c236cb2b7…

MALICIOUS

PDF

97.8 KB Created: 2021-06-27 21:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f733da036d427dea144cc0c54ddf4679 SHA-1: 021eab6de047dbede5d941a2e805ce4ee80a7074 SHA-256: f63fcc9c236cb2b71a21140862e058edccce5d8db6d2fbaa119f39ce4ae33706
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded JavaScript suggests it may be used to redirect the user or execute further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16070cddcf3250---suvevufexuposusiw.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/cc4c16862b59127345216f186c3cdb7a/6300659116.pdf
    • https://fulzugaskozpont.hu/files/84636130044.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160867c98bccb0---99427754347.pdf
    • http://webursitet.org/Files/file/45985974948.pdf
    • http://nhandieurangmuoi.com/ckfinder/userfiles/files/73377475792.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/149ml7gn78br903uvm7l7a5iqh/xuxuvexasirasugexiwig.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606d45fd90941---benogexelipoxumewomikewex.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/a4f8c9799ac373d07a81be30a2975e56/77068262329.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/163a8c35d1f34c0247b52829460edff2/58610762116.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607648bfa2545---sumafeximotitivet.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/0da8ip23hnpupjc823fj9g7ch3/28530821835.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/16b1fb666b4fe08ca10118f3a5a7d034/sesukubejepijubudog.pdf
    • http://aps-mes.com/files/file/vezoxosamoma.pdf
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/ravosorarexevuzurefezafe.pdf
    • http://hourinkan.net/js/upload/files/26056289823.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e745a4dfd3---jotefapagazavajo.pdf
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/75222324178.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/1lo6f734gs86q48fcqvjaaaln2/2241815219.pdf
    • http://ortetel.de/kunden/schurig/ckfinder/userfiles/files/45977341186.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/ttr8670oofngnbu44pktvho1cd/53369413144.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/39631a2dc268246f67acb62c79ce46c0/xevikakixepobekijejuz.pdf
    • http://webhenevents.com/clients/868374/File/vuwurutijap.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736a53b3202---nexubatadezeveke.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+many+calories+does+one+cutie+have
    • 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_off000114f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x114F4 16792 bytes
font_01_sfnt_off00012d0b.bin
411e6b3c09fd6aac964e70efc280f455cc370ca9cf256cebf3dc912b03320126
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0B 10992 bytes
font_02_sfnt_off00014668.bin
c1b79d5725c36ce9573efd6793ac1e8b13612f67d7e81d48f2631bf94d9f0731
pdf-font-stream PDF embedded font (sfnt) at offset 0x14668 20184 bytes