Malicious PDF — malware analysis report

Static analysis result for SHA-256 e75d36a2d689898e…

MALICIOUS

PDF

85.8 KB Created: 2021-09-09 15:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fe562d570273dd6d02dcedbe70dd6fda SHA-1: 6d046b02ddd3eaa451da5822ed6629e2118336a9 SHA-256: e75d36a2d689898ec4be321eb39a54d91a5c8aee08ec7ae689001f67bc78c20e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the nature of the embedded URLs and the 'link farm' heuristics indicate a likely attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/v1gq06b4pknmo0jcdjp5argf9f/zakidoxisaputomabagebosu.pdf In PDF document text
    • https://visualarchive.bg/files/buvumo.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/xugimo.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/kugitetufe.pdfIn PDF document text
    • http://robbes.nl/media/files/41637468699.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/93590951162.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/toverewabekifaviwopas.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/radibasumavebolopobisek.pdfIn PDF document text
    • http://skmsm.com/userData/board/file/95210511912.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/rizamoxoximawafakume.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/16992887028.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/7537352766.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/34596379102.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613260327ab39---jitosexadanu.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/derobofitivizanefivata.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133969925745---bewurebikafiz.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/983853777.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/59700180877.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/pupisuvusikolav.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/xugajojo.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/72763276728.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/161316a31160da---3089935105.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16139f66c5c722---55370232325.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/nafagitufeleki.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/jodoxage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=inspirational+wallpaper+for+android+phonePDF link annotation
    • 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_off0000eaba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D1 10632 bytes
SHA-256: 5f67afa0321eca0d3f6761db0dd3d13a7eb8074c0d2429477320e726cd22897c
font_02_sfnt_off00011b1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1A 17620 bytes
SHA-256: 1dfeaf00c7353ffe93c3bf692f53bb5dd61098a0f6368306346eeae516157784

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