Malicious PDF — malware analysis report

Static analysis result for SHA-256 be5a1bd4445bb86d…

MALICIOUS

PDF

79.2 KB Created: 2021-07-26 22:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e49069160a6855051abd76b60eac804e SHA-1: b9522928ce6d3b76bcd093fef3b0df4b3e04d03e SHA-256: be5a1bd4445bb86d44405a8c6a1a9873045ff4460c81dc3058a6c5ecbce4b1ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or SEO poisoning tactic. The embedded URLs are likely used to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.mii.net/wp-content/plugins/super-forms/uploads/php/files/d7ee11cb674cc8b2d5c6cc6b7e1be598/30613975743.pdf In PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/aablvgq2kob3c11c78tjnihvd6/bepetujoruvixodupuf.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606de3e362999---44707322363.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/ruzulomatatolasebusulaz.pdfIn PDF document text
    • http://chicohigh1987.com/clients/47015/File/89678035878.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e661ee27bd---dulujog.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/zasefotapoxalibebid.pdfIn PDF document text
    • http://adveotec.com/img/file/tugopuzizek.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/59058535248.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/72d059d53f29cb06b990c3e43d64fb73/gosiwesusumevemedawi.pdfIn PDF document text
    • https://www.epicbrands.co/wp-content/plugins/super-forms/uploads/php/files/c8f21ede6106ead584e8a9515f149c41/jiriwa.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/e69e9955de68149e6338fa3a4c103b52/77918332263.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/galokuj.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/66394662171.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b002b8c0e08---8315183528.pdfIn PDF document text
    • http://absigorta.com/E/file/medadasodaluburamegep.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbee36b1c3---4815983088.pdfIn PDF document text
    • https://rajaketiga.com/contents//files/77391977165.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/96a8e16274dd5738b5f346907bb64f1a/15812797662.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/78d332f42b17397e82591a215f994879/nowekizusawawako.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c88674ac9db---27294323207.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d079817321---73604111152.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/21824322564.pdfIn PDF document text
    • http://gloria-eurex.com/sumore.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=youtube+catfish+cooley+pickled+pig+feetPDF 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_off0000d434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD434 11124 bytes
SHA-256: 8ccaaa62a0e2d180f46dab0c3b001973bd5cbf41f28374faae4725e13350fedc
font_01_sfnt_off0000edea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEA 15836 bytes
SHA-256: 352242a4451f583bf9026196687af2962d8a43615b88cba10575cccf1ea96a16
font_02_sfnt_off000116c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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