Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2a5e459268f774a…

MALICIOUS

PDF

83.4 KB Created: 2021-09-10 09:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a432c6c3e1c24e1f555a3e5716fe922f SHA-1: 1d93927f4a454ffebf8a37aeb9c6c92bf4f02d55 SHA-256: b2a5e459268f774a6762a172db0d75bfdd122adee4015b976c20080cb5fe7c78
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 phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites via the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=omegle+talking+app PDF link annotation
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d25c89ddb---61952937075.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/78049709516.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/vavunipixapa.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f93b8dfe16---45030515562.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/51001310714.pdfIn PDF document text
    • https://asi-filter.pl/files/file/16313242366.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/baa344871b1593bc0e04629c3f3bfbbf/63339842452.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/356342713.pdfIn PDF document text
    • http://htygroup.com/upload/files/femezixutiv.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/sojelodawubupusutuliw.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/wojozujogepekiwab.pdfIn PDF document text
    • http://edituj.cz/res/file/84500875290.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/lukunatotexefubaj.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/dumikubap.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/xuvilafamubugemubof.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/33409322264.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/48486273237.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613109411dc23---15186435699.pdfIn PDF document text
    • http://pronobile.de/catalog/file/wurutuvobefidasadatuxo.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/52556237333.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/36869198383.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/wilirawulevavovujupe.pdfIn PDF document text
    • http://anduong-nhatthanh.com/uploads/news_file/tovezapezokif.pdfIn PDF document text
    • http://fitviewer.de/files/file/nakajilasazovifuxabodanu.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/ganewezinawinesituzozud.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_off0000e299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE299 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAB 17872 bytes
SHA-256: ead8c7fe4f6df32b32200a8a70d99185dda5db79db3415fc5974973780961a3f
font_02_sfnt_off0001287e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287E 10324 bytes
SHA-256: 435888d7ff66b978ef3a9634ada707b82b66e371deb08780d12ad3c6e0114330