Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ea4d55cb3fcd05c…

MALICIOUS

PDF

88.8 KB Created: 2021-06-14 14:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 67d97aac2626f80cfa3158c19f69cfcd SHA-1: 72609766dc383fcbf6ef13d45b5eaf52b0025891 SHA-256: 9ea4d55cb3fcd05c69dcc50b71196b9ddf6aa5aada1b748a855c07d59fa7ab1e
196 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a password-protected archive lure. The document's structure and embedded URLs suggest it is designed to trick users into downloading a password-protected file, likely to evade security scanning. The presence of multiple links to compromised WordPress sites and disposable hosting further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://huntic.ru/uplcv?utm_term=rar+password+genius+crack PDF link annotation
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/89celbg085bjck46ap1c8i1tkv/firimiseribabuwexanilirab.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a85e6a37d15---78369912827.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d65bab51d3---tikowusewigepedekif.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/92945270748.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/0d2342a61cfa582c3157951d905d87f3/depelajabipuroxasewotap.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/raxanavibuto.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b23d83927---75869816504.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/22769727053.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/20886852773.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/pariviva.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c89dd36176---82267604895.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/90580713562.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/30886395048.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c7941a81c---79250737536.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/banig.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16072ec13782cf---1025651134.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000129ae.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x129AE 24340 bytes
SHA-256: b019880b528b2dda50a9a2cc8ed9034416503b55abfa9bce78140930b1b9c0af
font_00_sfnt_off0000e992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE992 5372 bytes
SHA-256: 4d10500968ee826f455ad483713f55ba81b915a8cbd60076bbc503487b85236c
font_01_sfnt_off0000fbfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFD 1932 bytes
SHA-256: 4aa063a26bd9e70ad0d04acb797bb2078f152c78321be1114478748fdf4fbf58
font_02_sfnt_off0001053f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053F 10564 bytes
SHA-256: 2ecd4cc4b5a77d6a22194546943de312c900de73ad9d86df2e95b7e22cd686b5

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