Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b75034ca1760dc…

MALICIOUS

PDF

89.7 KB Created: 2021-09-04 04:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e11fa8bf57fd008f283392d0b1f111f1 SHA-1: a842af513bac45e6c7d4f6c4cbaa156a1458115d SHA-256: 04b75034ca1760dcd2bbc76fe5c5241afcb0d374caeffa77e0899564a79de7b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF containing numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the nature of the document as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://krisoc.ru/uplcv?utm_term=livre+de+conversation+francais+pdf PDF link annotation
    • http://onthebroadway.com/CPD/adminpanel/upload/file/letegub.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/63248014484.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/veganizojaz.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/jmak75rftg8an90nr0llo0mv7h/46068026401.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfb26ae8c7---9576884179.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210521005809.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160741722d092b---68095811241.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/tukevimafetakok.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/90569062947.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54e6ba10c8---37068388647.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7a514cbce---felireko.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/a82227ca81dbe8ae0701923fea1bbf90/88863623771.pdfIn PDF document text
    • http://email-database.info/userfiles/file/pisamabevanojebidotim.pdfIn PDF document text
    • http://hopkinshigh62.com/clients/7/77/7764523e397120ad9b09b1da26998858/File/98112180166.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/63067842535.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/jubotuz.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/ab4d4bb10ed89d75a983b8f2e5706bd6/35496864215.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/lewulodabifo.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/kijamujunalubosovedob.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e712dd42d2---tikawuzoledalidobukapowim.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/10599430724.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52C 24684 bytes
SHA-256: 7d51b27af9210d9784c22a736a9a5b48f7e628069517a9b08d805e082f2dd6b2
font_01_sfnt_off000112c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C7 16208 bytes
SHA-256: d2de3c28bbf72132915eab0aa829c4d70e03f8d80d264e8f5d487c05dcd420d0
font_02_sfnt_off00012898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12898 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000140af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140AF 10592 bytes
SHA-256: 026aafd4053d744a61d80796c57025db758873c8e90ebafdafde15efadf4410d

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