Malicious PDF — malware analysis report

Static analysis result for SHA-256 cadce0bf49876ef6…

MALICIOUS

PDF

86.6 KB Created: 2021-09-02 19:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3e4f06b9ea5f500d496c3650abc4dfd0 SHA-1: 3cd4b18cbdb47341888c07367afe7769f4b810e8 SHA-256: cadce0bf49876ef6a8b1424d17085e4881e68abfa058b1fc2e0e7b1a0e0f74f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate attempt to create a network of links for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=optional+protocol+icescr+pdf PDF link annotation
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/qqi9o752k8lnlkje040da1hfo2/bopolomanusujogedikivegi.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/vinenixowevamurusagibafo.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/6240616123.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16076dec3baafc---sulig.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/krgmshqs3erk0a76h5atic2jp5/76530373715.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/winolafenabezezo.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/jegii55dqu64tks475majalda2/78013391985.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/cfc2964f3f24535381afd2d6a8e89fd9/5335194842.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/5nuuice5cm44d9naakpuurk4e5/38726002812.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/66994964348.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/sr2vuvehfhe677jpql9aem4jb2/xujovozubef.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c38e56030fd---dizuj.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/cekjnbglg1qsp4evdc8i2cd1r1/88971610630.pdfIn PDF document text
    • https://energooptima.hu/upload/File/77269451949.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d07e8c5f7d---26387287359.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/jazivepagiti.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/gekoworiluwolevusojeror.pdfIn PDF document text
    • https://agermag.ro/mm/file/48197659579.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/63140020131.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/0d63c0f8e7a8eef2fb261b77f29691cb/gurisiwifidusofa.pdfIn PDF document text
    • http://danburyhighclassof1961.com/clients/b/b4/b42d7d7907ff1a67dd6fd366dd3c6775/File/mebatum.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/7540329235.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/ruweroxotaj.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca072bdbb5---5600217274.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_off0000eb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A2 18724 bytes
SHA-256: 89da39db860a3ed255f9fd0ca8925a444de1d54b924555a27e96210236f288ed
font_02_sfnt_off00013430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13430 10640 bytes
SHA-256: a15b30742777983dfcd319210082055285e5cb86b24c3995007695ebb795c40d