Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e5120ed879a864e…

MALICIOUS

PDF

68.9 KB Created: 2021-09-02 22:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7a5922120bf132cd64c96a0012d1901b SHA-1: a03a839c09b5bc8515cb1e3d38b5da30e573dc36 SHA-256: 4e5120ed879a864eac51881402e32251c29d572602fce7d9faf17c2134518f44
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous URLs pointing to compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://irlanc.ru/uplcv?utm_term=optimise+b1+workbook+pdf PDF link annotation
    • http://buchtel1967.com/clients/26382/File/juduvumudofob.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/n2ehjdd7il5tkmmbcknd01qtvd/dirapuvutupe.pdfIn PDF document text
    • https://znalac.com/userfiles/file/gidelumekifabeluj.pdfIn PDF document text
    • http://modra-skola.cz/userfiles/file/wasememevajozalegomakegik.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/50110740646.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/48376051060.pdfIn PDF document text
    • http://sushi-belovo.ru/files/xosobodisetibezetujus.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b02e7b75648---16091208641.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be3a40f3616---figulozusuromuputiribu.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/pudererepodemoragepug.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/ekbo574k8pbhct7iq3mkujl13t/97822318231.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/81353296869.pdfIn PDF document text
    • http://esistore.be/userfiles/file/zovemasutiditi.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/ruzudokanibif.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/2c428b51132bc7f5160af2b6738d8e09/12609964487.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc25044d30b---38360849521.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d4e9bb91f---87943198249.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/5cdb68504524ad4166a32a1d8e6e5100/voteno.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/15345675031.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/jumuvalazigobegol.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/4763bebc728d2ef545dcc356c4519a08/81797593920.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b1b364cbd2---85333136016.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/61839496156.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_off0000af46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF46 15044 bytes
SHA-256: 1e0f41dbc8072ef6adda2195e3aaa9673657d8248849fbb39a1f4d6430d44a80
font_01_sfnt_off0000d589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD589 10740 bytes
SHA-256: fe3f8d2ad915a6c8b7aa75cfc5becb8036a1c241e48f48a095a7b4eb67a497c6
font_02_sfnt_off0000ee37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.