Malicious PDF — malware analysis report

Static analysis result for SHA-256 92b9c2952987470e…

MALICIOUS

PDF

85.7 KB Created: 2021-09-17 00:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eda03d80d4825dfe9f265c08f06b47ed SHA-1: a5f7dfa1be9ddde7b76ad4ebe5794533160e19c8 SHA-256: 92b9c2952987470ebde1b3d79f89ff200f8d3804abd03960eb87d8dfc1971c3f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress uploads or disposable hosting, forming a link farm. This suggests the document is designed to lure users to external sites, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • 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 http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/joduxizepedovo.pdf In PDF document text
    • http://stmarysharipad.com/userfiles/file/gigilojugexulonuliwize.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/dovowu.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/27914529480.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/28736957379.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2dedb6da6---bujejesawunoxamodu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6a30b6db3---welurotegupevopodil.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/nomaw.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/mabivumupapuboguzimo.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/25062098280.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d51cd8bf22---65482034222.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/jibomavevodo.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/68303a01ca6137250ce9d8b216fe0742/30061768111.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210912000302.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/guzizezisugi.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/xudulodimutekogomonazad.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/jeganepopoxevirav.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/wajiratekin.pdfIn PDF document text
    • https://olterus.org/contents/files/7117254655.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210907_F6C55D6E76D8D3EA.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/53976334255.pdfIn PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/tofapep.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/rerewetodap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=best+app+to+record+songs+on+androidPDF 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_off0000eb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB21 17440 bytes
SHA-256: 2aa966917d4cde3a03b440bad2a357c580afc9ef37b20335af5a21ce11fe615c
font_01_sfnt_off00011864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11864 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001307b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1307B 10696 bytes
SHA-256: e3556d2c8707e6e5aa64c8c1783db3158414432bbeda8fd0d01ee8daa54e4ceb

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