Malicious PDF — malware analysis report

Static analysis result for SHA-256 b780ae2ab06eeab6…

MALICIOUS

PDF

87.6 KB Created: 2021-07-07 06:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7a813c22613248994a2e03ec8b81d466 SHA-1: 27f6cc93895f660d00272484587ce0b975fcb088 SHA-256: b780ae2ab06eeab61ae276815c3ee176cd0c41842f785f886129800a3bb6c575
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. No scripts were extracted, but the overall structure points to a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://wastran.ru/uplcv?utm_term=the+nightingale+and+the+rose+by+oscar+wilde+pdf PDF link annotation
    • https://tosto.cl/ckfinder/userfiles/files/zomosude.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c8d876506---93892891719.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947da555780---jetezi.pdfIn PDF document text
    • https://renault-service.com/userfiles/rasililalerakazol.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/31914930151.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/1f30d29a895b51b59c3e9cd3b1aa0b5f/jenekovixevunavubijuxu.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089dd21d9697---15926646359.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/rosesewixunawitaxodesuv.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607170782ddc5---wuwaxufin.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/89000753167.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/luparoduwuzuzumugubajunan.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/13655564532.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/88c9380d8c8bdc4afbf1c11dfd35de50/71822936039.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/24814022411.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/3162ae9cd7ee2d90a8ea1487860f888d/45029907141.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/geloduxovixikekisam.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/83e475b09b2ee6711d48e51c19669a70/tumivomarunun.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/mapusugidaxeserarefuvu.pdfIn PDF document text
    • https://mmszke.hu/files/file/75051069479.pdfIn PDF document text
    • http://stpetersame.com/clients/9/91/91902b33218228c9a3691be2563b71f1/File/14568366162.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/24113744095.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/7e2f97f387429759079bbcf67ca9e066/masugazuf.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_off0000f2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D4 11200 bytes
SHA-256: e231cc2d6ad19774c6c7175870144249e6ec8efaf712c38f7e68eb6ac82b2aaf
font_01_sfnt_off00010ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B6 16444 bytes
SHA-256: 92eddce0fdd014c1633f23e282e40c45e10d8d6184a5f010e460f8da1c6cd4dd

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