Malicious PDF — malware analysis report

Static analysis result for SHA-256 e34c45d75675cbff…

MALICIOUS

PDF

86.3 KB Created: 2021-07-22 20:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4428ad6df1be88d4ad1b81fb5b50848a SHA-1: 0104566166106570e63fd7f01ba3e47b9fc30b7a SHA-256: e34c45d75675cbffb61ff568309cc4d7598bf43ca9ace1e80423d74cc43153a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF sample was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan-like behavior. It functions as a link farm, distributing links across numerous compromised CMS uploads and disposable hosting sites, likely to redirect users to malicious content or exploit kits. The presence of multiple external URIs and a link farm structure strongly suggests an attempt to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://okmarin.ru/userfiles/file/ledopimosuwerutobijefa.pdf In PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/f6939ade45735d89f1c42b47473d319a/59708555903.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/11504245302.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/129878367.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6df0f517c7---64257359715.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///xarewejabosi.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/51355642960.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/57947956887.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/mijigubesaxixezajuj.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/54816582485.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/namekojekosixepejafiv.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/2695d3b32deba9e4c92df0544ecbfb45/44592495017.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210601210554.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d2315c5f405---58399770918.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f48fb9c3df---31104230899.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/93564286918.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/8hg37tdtfo24nuf5v5ajbv3v4m/mibive.pdfIn PDF document text
    • http://kristenpell.com/userfiles/files/logikokurafezurub.pdfIn PDF document text
    • https://soechi.net/userfiles/file/44767296585.pdfIn PDF document text
    • http://whs1979.net/clients/65916/File/67212014162.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/xuvalidowap.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/7170baf8769fa61436151cb007377a01/wogom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=typescript+protected+constructorPDF 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_off0000eb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB94 17884 bytes
SHA-256: 1caf06080569d1453af65e72a9348de4b36aec6d182adb1837d1b433f884d27f
font_01_sfnt_off00011ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132EF 10476 bytes
SHA-256: c6bb54fa9f7f07f1370fb694ce4b26f5d3b9754b228772ee1c8653d54be9b0e3

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