Malicious PDF — malware analysis report

Static analysis result for SHA-256 e13a83a39facef35…

MALICIOUS

PDF

94.3 KB Created: 2021-09-17 16:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 284d50c6fa8ec35848c6158b37699ae0 SHA-1: ee0c465a7cc3102a439c1d595b544610cf16dcdf SHA-256: e13a83a39facef3542bbd991ba006c9926da5e008085d70128ca27997b0dd25f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains embedded JavaScript and a large number of external URIs, many of which point to compromised websites or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially harmful external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://infrive.ru/uplcv?utm_term=how+to+wipe+out+cache+partition+on+android PDF link annotation
    • https://maritime-models.com/userfiles/file/pugijukeduripesosedore.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/440cc670e607229321f9903630dfe9e7/43527912949.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/66285351387.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/maguroxuvapomamubaguxanas.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210914043615.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327d43d5e70---90557647179.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/1f13rj4d5h4kbp5qn8c7v64etl/livenubetedolimeb.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/rewug.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/gewipilezoxobeposo.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/bujenupigujabavanabul.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/virajozideneg.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/64401249182.pdfIn PDF document text
    • http://emaaravm.net/upload/files/bopuf.pdfIn PDF document text
    • https://istanajp2.com/contents/files/fizileget.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/waweluluganemojonaga.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/xivawezigo.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/lunivemevabimilexowomuto.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/clb9qvc99u7f9868m48ngdr8hr/vojalapumatefulerasadex.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/mokipenupadugisurud.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/gitibugemerekakidiwej.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/rorisojus.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/pimebizorusegagaperajusas.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16134c38347d1f---wipurumuwutote.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366f68bc199---74344121818.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/komad.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/51209026269.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/9574570092.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_off00010922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10922 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12134 19136 bytes
SHA-256: fde451f879092a733745eaab7ae9a124e95943e7558e11964f60d4d8b7ca9a46
font_02_sfnt_off000152a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152A6 10576 bytes
SHA-256: 4486bb0f1692479fa6b975982ab5e6c0811b502b21d1f1d990922bfa53c00bf4

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