Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d9e7cfa5ad8937a…

MALICIOUS

PDF

88.0 KB Created: 2021-07-06 20:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2cc4685bd3e2dd42d3632258737eb4f1 SHA-1: f52fbac5e9e59fa4393aa5a36ba02a20db8caa59 SHA-256: 8d9e7cfa5ad8937a3b510f4b26cc4f81d17d6cadc845433c35cd2a4039dd055c
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also exhibits characteristics of a link farm, with numerous URLs pointing to compromised websites, likely intended to redirect the user to phishing or malware download sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://pistant.ru/uplcv?utm_term=how+long+do+you+bake+whiting+fish PDF link annotation
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/5490625ab56a86efea6904820bcc8fee/58019061396.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/zidedezijofuzuti.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/2cecd1b2f7b4205f3fceafe47a8305b7/xirisotidewabar.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608807b738b9c---lugelevofemujusefewufi.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16093e6444680e---tolokigumagujif.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/miruxilumuwoxug.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/18b4784b342a941abac5baf045726f45/37175803147.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/9c8959d0832fd1fde3caac6d9dca0f0d/16755087310.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/51164705497.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/68807849252.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/52944726455.pdfIn PDF document text
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/90f54084beb2c1b6dabafcad435b1ba8/62508802692.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16088248191a22---53028382367.pdfIn PDF document text
    • https://flyfinz.com/userfiles/files/77129073042.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/717398db593d0b538603cd064eace10c/firopamakisime.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/jrn5i1lmqvv5a46l7mahiorpc4/58279097526.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1dadaacc1---duvifozekud.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/6660fc9f370e9bff9f335e3243125172/zetigigeneromevab.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/fa21d9fb8660d3212cb0a76066776e5a/29566818205.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/qcmdn2lsd1ao4spcu1qgqtnr6t/nuguwotikutosopixulafafop.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/nidijojasokulumaz.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a565a072009---64156366108.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/9d8692bb66d2f325a1a99b85cfb318b3/38972874396.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5aab6c3b3---nesugosigex.pdfIn PDF document text
    • 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_off0000f421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF421 17232 bytes
SHA-256: 25e3c21bf6b61194fde3f601539cda8d9e868bb7def5dcce3030eed7e014599c
font_01_sfnt_off0001211f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13936 11056 bytes
SHA-256: 5509d9155b8ea855e0b4dc8bf29e2fc98e0d7ec978c0d8ec51402672da0bd66a