Malicious PDF — malware analysis report

Static analysis result for SHA-256 9beee39f7b1c81bd…

MALICIOUS

PDF

95.4 KB Created: 2021-09-01 10:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ba7fbcfdf303971d719bc53537acf47d SHA-1: fce1e8eae58c911b59298ea3e3c8db639594fb67 SHA-256: 9beee39f7b1c81bd0aee566fe102cdbbdfbec3ccaabb71e7ead054b5caa6284b
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics point to the PDF acting as a link farm, directing users to compromised WordPress sites. The embedded URLs suggest a phishing or malware distribution campaign, leveraging these compromised sites to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://chcial.ru/uplcv?utm_term=decipher+a+message PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d18d15b454---gasubo.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/buxorul.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/77637024719.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4cfd75501---bomizufaxeketosobi.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/7a1a0fef306a6b280f3e24f9272efc4a/6158552353.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91174c96ce---jogawugarosisege.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/tamazafuzuvapoligilok.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/kuzuvuk.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/12084254883.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/62142534547.pdfIn PDF document text
    • http://dentherapia.hu/files/file/13922362346.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/81421381971.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/084749271c7673ff7647e2c19b833e1e/72412413723.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094009b3162d---43694365215.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/pedasow.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/97242445195.pdfIn PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/lekida.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/15972201801.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/29987611040.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/purososik.pdfIn PDF document text
    • https://lecachet.fr/docs/files/41674134825.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/83552372876.pdfIn PDF document text
    • https://wrd13.com/force/file/61713026551.pdfIn PDF document text
    • http://ural-kip.ru/admin/ckfinder/userfiles/files/wapunabejoviz.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/zoxemuxudubagu.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_off00010d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001257a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257A 19188 bytes
SHA-256: 113e1805a80e9858677935f6444fd7210b30e3ef2b9ca808f8c184727f20a5bb
font_02_sfnt_off000157ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157AC 10452 bytes
SHA-256: 8b6a27b5db6109b3b31cd12695f30c7bf042ec1afcc8ed0beced003724e8e751

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