Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b2710c35548e618…

MALICIOUS

PDF

83.9 KB Created: 2021-06-17 10:34:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ae7a34b347c8cff9bdc7c31cc89011d0 SHA-1: 64e39736429010b81abea4f03bb5fd8821b56373 SHA-256: 9b2710c35548e61880241dde18ca77f7df887d767a606393d04f4862dba4b19f
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://oniceh.ru/uplcv?utm_term=universal+self+scorer+biology+pdf PDF link annotation
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/deed9c1487cb4d0fca33fce76d62428b/xefawej.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/33701678187.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/bovisidili.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/raxikalisifumibedegerof.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6bb58edf5---16484818551.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/bitel.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964c5b41e29---dilupidawogudenegamo.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b901da280---48598288161.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/c61007c00ac0dec224d90a089e2f944d/34409048313.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756e2b96a1a---16837946929.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfd07eca8f---35668078329.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/an5bs5qvbpejhjimk37b8nbcub/ludopuzogarujerimuv.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160884247b7f48---nemovokubuvibowivamop.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608358eb4de18---65782498591.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2184d94be7---rosodas.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/kudegurusirodowu.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7b0d3b222---51397551980.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/bevilofejekadafijawesopir.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_off0000e768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE768 5616 bytes
SHA-256: 1e1542569c316838c04cf6868b6a445700f52924ec8ba20ab58fa7a541d79bf3
font_01_sfnt_off0000fa96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA96 2116 bytes
SHA-256: 991f7ef292b59849fa1804c361c52a6255426db797fbcab3b5d31d1f34ee76c9
font_02_sfnt_off00010441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10441 11656 bytes
SHA-256: a0fc8cbce06a9998a1326787ee09a11ae4d3b5c11947d08c42c76b7a84dc0342
font_03_sfnt_off00012beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEB 16336 bytes
SHA-256: 70a14e0d3b96815a4cc105cd0ebd44f630d556efc7362d149d49b2296f6d5599

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