Malicious PDF — malware analysis report

Static analysis result for SHA-256 500b21788df1ace5…

MALICIOUS

PDF

101.9 KB Created: 2021-09-04 12:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 42e37c8f6c9cac27b27fd231a0f907d1 SHA-1: d5f6eab8f2c0a4b97c568ad5cf22d3a5bd253eab SHA-256: 500b21788df1ace58f96d44a352513412ac1516bd7d51a533620337e0b481bea
204 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 websites or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript and the ML classifier's high confidence score suggest malicious intent, likely for phishing or malware delivery. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://hanleyresources.com/images/loravifadabotivowifafuruj.pdf In PDF document text
    • http://polesprogettazioni.com/userfiles/files/gubowa.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/vejepujadilaw.pdfIn PDF document text
    • https://ahha.az/userfiles/file/58918139050.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/titozosada.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/na9t1kllstobkd8ojdr0jim6da/koxilixedowo.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/71802699086.pdfIn PDF document text
    • http://planbmedia.hufiles/12357988045.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca0dc52f82---watulakiwiwodoniniwo.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/wiwadexavaxorakik.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/6090291737.pdfIn PDF document text
    • https://irantruck.ir/data/file/malebaguvorapebowenam.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/1c2f73d37ff61e7838cdf7ed9759155d/64893503912.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/befafuxa.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/72390333967.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/torufevilolef.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/zewokokoze.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a93e21e79---47431833195.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/e9b3e2f7322756a78cb40c77270d5443/jokamet.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/425444329.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/39551643893.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/gibezedoruvurekitef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=application+worksheetfunction+if+vbaPDF link annotation
    • 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_off00012575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12575 19528 bytes
SHA-256: 756c858d7b6230d33aaa38667599e4598b9779488b6c512b4407c25c33536e8d
font_01_sfnt_off00015836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15836 11040 bytes
SHA-256: a12e00dbc986e1f446e7379454f1329b5a9cc90dbd4dd5f51ad6cbc3a3455af9
font_02_sfnt_off000171ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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