Malicious PDF — malware analysis report

Static analysis result for SHA-256 add2668a3dc23eb4…

MALICIOUS

PDF

70.2 KB Created: 2021-09-25 00:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ea03bbbad8eade72fe4d46b4e3d19e28 SHA-1: 47f890348472dc879ff839b9f41ef8310ddd870d SHA-256: add2668a3dc23eb41ef4fc2aafe0299d62da6a708b10c680a467dedd80808c61
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised or disposable hosting. The document body was unreadable, but the presence of numerous links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ab8d191b8---jetenusewujar.pdf In PDF document text
    • http://gostinica-domodedovo.ru/files/nejefotole.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/84197684854.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/17020122226.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161378740d8385---fezisiwewatoku.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/lezovunixasivar.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/34866581648.pdfIn PDF document text
    • http://klemanpince.hu/files/file/fawotep.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/531b21acf3c3fce8ac986b6c084185b7/xegiveg.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/03b3730ae0f916a26b64bf70dcd9a8cb/xixanurubizatula.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/fasekimisab.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/53158119556.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/1349313859.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/takowidezenunesenetop.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/nejejotukigexura.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/jerazolodosozev.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/notaninaxo.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/fobokobi.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/29660103197.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/kabidisajujawivikude.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/26609411512.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/nareraxotuxepugufiseser.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/94328378275.pdfIn PDF document text
    • https://vientangluc.com/upload/files/wujamofuxivin.pdfIn PDF document text
    • http://ore-processing.ru/d/files/zenijenodadegipexura.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/xinutokigux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=convert+pages+to+excelPDF 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_off0000b2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF1 15768 bytes
SHA-256: ef6bd162038fe03d4eca04da6ace09287e579745169b20832d770a030f0aca87
font_02_sfnt_off0000f2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B8 10656 bytes
SHA-256: dce54e7e361c17eaee943a23b5e7fa33b6de92201eb4ba4b2520448ce33e4d61

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