Malicious PDF — malware analysis report

Static analysis result for SHA-256 1621764edc7b29c1…

MALICIOUS

PDF

93.0 KB Created: 2021-06-17 06:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: dd35282d7f6991c150ce8507253d75f0 SHA-1: 9711a59991f69de6365221ba1e05f8674ee4eaca SHA-256: 1621764edc7b29c128d3f3d7e8170c8f08d4c9a09999a7cbf0b6aadbd23ccd15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://archism.ru/uplcv?utm_term=othello+shakespeare+book+pdf PDF link annotation
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/688e03793d99601593a36f8f1bacacc2/19725034022.pdfIn PDF document text
    • http://dzbnf.com/upload/file/%5C/mokewuwejepefajavifufaj.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/64acfe0bc113a23ecc3fa3341abf2552/66607371937.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/mr9b5gu53t6okrh65mj2o21vku/numatadarizan.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160931e58b7eba---wakirafojinogowugazipemo.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/i5hfpok0j0aprp00rprqf2bat2/39674183634.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/kizuzaledasexebivibasotaf.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/78142055553.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b13a6d8aeed---kedepididapenimulex.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/j4j4rdbmmbgssr286161filrr3/poxanug.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/5c85ca4f6eaa5aa9e4b35593f9739422/pafiva.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5afc8557d26d60fe687fdfa6b303da64/30946794174.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/40096876256.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/burozadorumo.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/90fbfbb92c287dc3382203b27638e5cb/85275362065.pdfIn PDF document text
    • http://abc-tel.ru/data/File/linulukepadonewanidun.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ae781014e---kudawo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001087f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087F 5360 bytes
SHA-256: 1e5ec1e3d2a9853d847ac77fe2f145205dee38ec81e0e9d1617eafa1197bde15
font_01_sfnt_off00011aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA1 3368 bytes
SHA-256: 7d7683e48ff215345a570cc069df5f0a2df957f100c0c18366de5fcd954ecf17
font_02_sfnt_off00012722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12722 10816 bytes
SHA-256: 81a72ec97e900b30d987b58c3dff1c3cf9168a4861191f2961d308507fa6ef64
font_03_sfnt_off00014c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C38 18112 bytes
SHA-256: 999e605e455fe90be1c7e2aff1801488cc4445d25fd7187ca6f8b21409ef1723

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