Malicious PDF — malware analysis report

Static analysis result for SHA-256 be5e4c9808d79e77…

MALICIOUS

PDF

94.2 KB Created: 2021-06-26 05:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 743869fa12c7ffeb92a18581eca6a00d SHA-1: 01a80ab7cedb4929defb2875792ffb962f308606 SHA-256: be5e4c9808d79e771f91aaf5abd62aafd5352a6284be52c55d258e6a4f190087
156 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were directly extracted, the structure suggests it's designed to exploit PDF vulnerabilities or trick users into visiting malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/c31fb9454155da4c2d3f69a2a0bcfe1e/xaronegebowilotufimuluw.pdf In PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/lr6na686rvu5t9mqmndpbo23j7/48902916247.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/45096781317.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/3tb6sqm2qds7lcqs5knc9vpbg1/xogefoj.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608172b419f26---47558992026.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/f9b06fe0e773c9e0c57f85f4e7bc0b34/tudepigalanetuvo.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/19406720930.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/d3b2f10a35ab8338f7f371215863a8d1/weludenufu.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/81f8eea51ef98ccc2e009f47be02e1c6/80384236392.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d61db39bb---99477747013.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/868eaac0ca69b562f9bb85d80207eee2/dunajaja.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/7b06d25314de6b01d84061c886210cea/71227681489.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cac910da2---80059780018.pdfIn PDF document text
    • http://firegallery.ru/img/upload/90329081010.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/xifozijopalewor.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-3/20210603212915678753.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/vixidido.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/solowa.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/76795549451.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b95acc0096b---12421936569.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809f0910fd8---mofina.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/gifubode.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16092c03cb4cc7---bofoxobiwixemukewo.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/vowaverobifanasibuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=litany+of+blood+eso+guidePDF 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_off0001090f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090F 18524 bytes
SHA-256: 440555ddffadc91ad6d03c85dbcbf80c911e1281e3d280984fa4de91f12e596c
font_01_sfnt_off00013991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13991 10740 bytes
SHA-256: 9b8b48d1d26fddb423ce4c910d4177a69beccebdf0e6cde58a51711773125d0f
font_02_sfnt_off00015237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15237 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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