Malicious PDF — malware analysis report

Static analysis result for SHA-256 c38570bd2909954c…

MALICIOUS

PDF

89.8 KB Created: 2021-07-01 14:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0e1d23ee40d6ed09f753f8fe678da482 SHA-1: c2757c7cbedb24fb5f6f117916a92692417efecc SHA-256: c38570bd2909954c4cf08cb64de8ece6604885a22052dd361b301533cd1bb359
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage and disposable hosting. These links are likely used to redirect users to phishing sites or download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • 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://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccf375d936---zaliduwipirid.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/tsdjaoo6untopr105khg5k69t3/5393243277.pdf
    • http://ahxxzx.com/userfiles/202104/file/xotesurekabobepenad.pdf
    • http://scamps.biz/userfiles/file/93211266174.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf90ceade0e---nezumupiritotosase.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/gitedezarodefus.pdf
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/notagetemigidof.pdf
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/tegufokine.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608343b21b16e---14101114605.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d5d9e13e0---nasalugi.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b197874d73---35504508229.pdf
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/bdcd198f193c0bf0d7265e0bdb893bd8/vitolobiponulodogef.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/f43c3a03470c157abaa06c1e99951e47/watunuparezibivon.pdf
    • http://ecohort.com/userfiles/files/zukatovubuvodavilaso.pdf
    • http://asesorgubernamental.com/images/file/48529750838.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607482c8cbd18---mitemogu.pdf
    • https://fidelishospice.com/ckfinder/userfiles/files/65381022816.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/45aq9vij090q0d58hkmgr51qkq/85268992183.pdf
    • http://progfin.pl/userfiles/file/tijuv.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/sufebom4rhpngh5qic9404qkcc/91536898980.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3a9452a60---dunobeve.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/vnfhdcja2m2f78nkf1e53t745q/79448171596.pdf
    • http://eschool365.in/js/admin/uploadfiles/file/xigomo.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/g0h64qfir5j44u8mqrnl5bmj7j/bizaxugedupasorovixi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=mpa+motion+picture+association
    • 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_off0000f91f.bin
fb238f2b94f88db6cbebd3062807bfbd518bb51075cc06816797283178ad8bc3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF91F 18440 bytes
font_01_sfnt_off0001297b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1297B 16792 bytes
font_02_sfnt_off00014192.bin
1c1fe46d943f27d7327fb170603c9a82cb5c908a3e11239a833187960abcf492
pdf-font-stream PDF embedded font (sfnt) at offset 0x14192 10580 bytes