Malicious PDF — malware analysis report

Static analysis result for SHA-256 506e2a8da3533df1…

MALICIOUS

PDF

104.8 KB Created: 2021-06-26 21:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 691d67d3648ce1f47aa549da8dad2b3d SHA-1: 450ccd6dc226fe1640fdd564debd0fe1bedc9ce6 SHA-256: 506e2a8da3533df195a49baf0567a9e1c363eaf48625b65970940a2b8429bb5d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The document body is heavily obfuscated, preventing analysis of its direct content, but the heuristic firings clearly show a link farm designed to lead victims to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 6

  • 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.
  • 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://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/af78fec5cbb16e12a06ef2ef53d9d394/duvemataguwofen.pdf In PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608de1df4b9da---75790375053.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/c2f52beea69db9d7ad9bb9bd4c64435a/durejitu.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/ajs5afk8njur8k8bd520uvh54e/winezibezavovutefov.pdfIn PDF document text
    • http://changdahk.com/upload/vukizegogevupag.pdfIn PDF document text
    • http://maihome.hu/admin1/file/5389277187.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b842706cce2---wazabotifopofonavos.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2a838cfc8---kikuludoxutuza.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/sezowakunakedepeveduxux.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/bb520e66a420a96c13532406279ff7b4/84942019872.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/a08c29201c67618dd56e911cee6c44e7/pawivuvosapepotafumozem.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/gumedapimugiv.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/ginekenuzidugo.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/vepejawub.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160bc05738512c---8570051374.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/a752941b04291ed34be237f3356e6254/78169202316.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e2f937ca8---fiminixiwurekudeziso.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/9b1fdfd4f7dd8ce5431aa0fd00f196d9/46668121756.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/02e9ee7dea71a1fdb98a6b718a5589d4/tonexuregizesisulenixa.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/d4c731b304e0ba4e3b5fbb98db7eedca/55719460055.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/ab369b0c5248ff35535c243123260966/nafavetanuvawalasired.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ce8d487c8---92829924189.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/9c1j53pd79coss0igg9c01q8qs/joteno.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/povomukobedaxuzuwujejidu.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/05315c4cffa0393d55437db18558f994/dikemusemel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=yoni+lingam+meaningPDF 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_off00012c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C38 29548 bytes
SHA-256: aa9184dfe9b594adf210233fbdd8b50a767609c03cad4eb2320426ce3878879a
font_01_sfnt_off00016625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16625 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E3C 10068 bytes
SHA-256: f8f4e0290eacfedc28453c439f94a7e8cc28ce4067488ce09029d9296fcca52e