Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fc7eccec8577bcc…

MALICIOUS

PDF

90.2 KB Created: 2021-09-24 04:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 542e4efe83ac2bcdb6393afb9fb417df SHA-1: 029aadd8be14f23489ac97100a4daa0c024cf462 SHA-256: 2fc7eccec8577bcc07263323e07cfaf13fa443a0825e66f3c8f4fce6f67fd106
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload via the embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://interconformity.ro/images/file/39474812447.pdf In PDF document text
    • http://oletrans.sk/editor_uploads/files/68728787809.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/33f419b77a50933edaf1cb6442609f9b/mafagegexujutiwetojuzita.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/de5cdc86d2b5f6e4958838ff62d3843c/dojejojaguvoferopexiwuna.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/68398808570.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/19/29351839920.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/ginepofotixamomeganazonu.pdfIn PDF document text
    • http://zimmerei-possert.at/28624186232.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/nonolumogiken.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/65459312691.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/30420166924.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135e7d97dc15---jomuretol.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/61525581950.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/94417965714.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/73577420774.pdfIn PDF document text
    • http://vkts.se/userfiles/file/togulolupumem.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/85806358251.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/42088981510.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/14120543000.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/kemuxuwusojotiv.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/gesexu.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/wiwulekozofavamiv.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/77601750533.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403dba559e7---witufuwubibugolonikin.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/nakononarufemowurajabejix.pdfIn PDF document text
    • https://liguecasa.mmsfoot.com/stock/file/wokux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=htc+inspire+4g+software+update+server+unavailablePDF 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_off0000f6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC9 18756 bytes
SHA-256: 79e6f3cbcddbcaa558ed8cae18a499258e4b222f57f1c63ca83ea1bb59b3f0a5
font_02_sfnt_off0001404b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1404B 11256 bytes
SHA-256: 40c978c403fa5db47e93df13e89cc35b82d0f4a312f411dcf1730799b382b93d