Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e385e36eebe375a…

MALICIOUS

PDF

77.6 KB Created: 2021-09-04 05:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb837faa62d345d5d3d83fe5641525eb SHA-1: 1ca49c298085117206006dd75778cf369b774fbb SHA-256: 3e385e36eebe375a90e9cd604e910b604b7827d38e1f2dcba7922ff00cc60848
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests it may be used to obfuscate the malicious links or initiate further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://cructi.ru/uplcv?utm_term=windmill+project+report+pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/df247fa1ecaf2843989216c85a956b46/zaxazuvazuxadimotivodumo.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/t4a31crd2akttl9g4981jt9m14/gupavizumenimas.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebefe57334---83502030538.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b3da0b751e1---nixepozizukizedaf.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/f5db704a3d3860ecd99984b39d2be86b/bibubiwinuserupigolug.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2955ea679---18861024807.pdf
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/56698555561.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16102fda7a37fd---51619197197.pdf
    • http://hanlacsclub.com/ckupload/files/mamezejinigipusumiwagate.pdf
    • http://secretinvitation.net/images/files/nuzofozelubuwumuvilujodo.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/69d7374a92fc8fa8cf40e5061582b896/81205963482.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef050c19a2---2091976481.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609271128ee20---vepapodovasolulosejago.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/pkt7cucnrrmfvven4mufm84fg6/pixurunujitu.pdf
    • https://menu2uplus.com/images/file/99865708621.pdf
    • http://grandrosso.com/js/upload/files/1628830644.pdf
    • http://whsclass1968.com/clients/f/f8/f849445bb2fb8f42e7c863050dc1ba38/File/45731301430.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160776ebe78ecf---58172181713.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969229a3593---82465515140.pdf
    • https://bczenekar.hu/files/file/68830717314.pdf
    • https://mtmhomeschool.com/mycms/uploadedimages/editorUploadedImages/file/70569979213.pdf
    • 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_off0000cd8a.bin
a2d8d394bb1221889bd9cd9b4a329799356218bb4b56ab63a22b6113fa65f7db
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8A 17468 bytes
font_01_sfnt_off0000f8d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D2 16792 bytes
font_02_sfnt_off000110e9.bin
0724fa2175c58e76830646775e53692a567dcc4610e0874c81b589db3491204d
pdf-font-stream PDF embedded font (sfnt) at offset 0x110E9 10576 bytes