Malicious PDF — malware analysis report

Static analysis result for SHA-256 dce03ad6e4bab4d9…

MALICIOUS

PDF

85.8 KB Created: 2021-06-13 00:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 86bee8401df3e8f557639149e12c6703 SHA-1: 3fa7f2f467807713f79d8e6854347b93dc1ab4a5 SHA-256: dce03ad6e4bab4d99358579797bb562c82992f22697b7b590ac0112480656664
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 0.9994

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://cructi.ru/uplcv?utm_term=ac+market+minecraft+pc+download PDF link annotation
    • http://aarogyamedico.com/userfiles/file/zazoforominawudomixodozof.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a7544ae47---19493964740.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a980cc31e5---xuxir.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6cd94629b8---dikojidixakiwosanupa.pdfIn PDF document text
    • http://momsystem.ru/public/file/vasaratulumadu.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/57785920353.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/liruduxokejidokururerabe.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098430440a7e---94289647477.pdfIn PDF document text
    • https://anup.bo/images/files/bozilesibonenanebewe.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/fkbqvpg88gqn2t04n0ttrsngav/66074047419.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda7724853a---54951876622.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160731995c3d1e---liputovutewopew.pdfIn PDF document text
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/jovasuxuwuxodisijoros.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210603004305.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b96a98b828---1725449253.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609439316c73a---jeduzexo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67C 5056 bytes
SHA-256: 8ceb84bc8b7852aabcab0e28d17baf5717222e16812e09ac168777b01ce3c4bc
font_01_sfnt_off0000f790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF790 2960 bytes
SHA-256: eef6332b6db7903a8c23a2ded0ba0bd9c4e4f60fcf80b7e963e656345aa0170f
font_02_sfnt_off000102ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EE 11168 bytes
SHA-256: 4eb81bc1cfa2e5a1926952302cddf1f6733a80db341eaa6bed27114e36748d11
font_03_sfnt_off000127a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A2 17072 bytes
SHA-256: 0d534df8ec2cacc745ddbde4e3c57313ac739be0323573e8fb492e4edd072ff6
font_04_sfnt_off00013f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F13 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176