Malicious PDF — malware analysis report

Static analysis result for SHA-256 830d7068e62c7c64…

MALICIOUS

PDF

76.8 KB Created: 2021-09-02 15:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5dd2e97d890ac400155eaea3c3f23d4d SHA-1: f5786e504d9e59b34599748fea107b06d5f5fb9d SHA-256: 830d7068e62c7c647b8eba9fe75afdceaca995d05532b3ffa5670696c0ab5b59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing pages or download further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 http://jgbt.us/pds/userfiles/files/xajebisusi.pdf
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f43984a144a---pizoxapemabopola.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/adb1aa166fe3e51a944911e9746810a9/67061598050.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16128c8d36e9ac---10336364372.pdf
    • https://danielstrehlau.com/userfiles/file/bomamajapefepamiwiwuxen.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160714c4bbc8cc---jotivotamuvelola.pdf
    • http://bestofbeer.ru/ckfinder/userfiles/files/rufudojojasikikama.pdf
    • http://straub-online.ch/userfiles/files/26455158221.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b2792ce49---90213509641.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1e3c1c23b---rujakutojesub.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/5bd9d8ffffc6d17dba036a70f30616d2/guronolepugiranasagero.pdf
    • http://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/kukigivikulidepapit.pdf
    • http://papinchess.ru/userfiles/file/35189450992.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/dec2f4853bd6d3cbddd3c792b8c95fea/baremebibukogisubukusajij.pdf
    • https://menuiserie-sainte-anne.fr/userfiles/file/311203485.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc8538ca03---47095458010.pdf
    • http://montaze.org/democms/userfiles/file/ruxufodarolozovef.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b901e60ea0---ropegelij.pdf
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/kutosusewe.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a5fa87984---duzirileg.pdf
    • https://binarbaidservices.com/public_html/userfiles/file/pisedinoneru.pdf
    • https://dagvandearchitectuur.be/_files/file/xuxepijopifoter.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/52e8362558dd300679e320995a8555b8/28930948999.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa3ed9b456---86116273976.pdf
    • https://demetraproject.eu/ckfinder/userfiles/files/rimejiwefugoxilowivij.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=training+need+analysis+pdf+indonesia
    • https://doi.org/10.29244/jpi.v16i1.25671
    • 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_off0000c7b2.bin
3eb0f8c039d37e56d899d0ad8461f89e8a2dde430887d43a5b5ac5552ebd6eab
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B2 10652 bytes
font_01_sfnt_off0000dff5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF5 16792 bytes
font_02_sfnt_off0000f807.bin
0dce3862cb8ef4597994f37216d891c520c62f1f6ac2278dbfa8bce8b9fc5ed4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF807 17652 bytes