Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd8370eea8f133c2…

MALICIOUS

PDF

73.5 KB Created: 2021-09-13 09:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 496e70b10b61d537d984c49da0c0ba74 SHA-1: 4b31a1d6da7f3f1442f27447cc56d974a5e1dc8d SHA-256: cd8370eea8f133c2cdc7069f355f82f11a489ba0bbc0c62a202ad4aa89e6b687
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains an embedded JavaScript stream and multiple URLs pointing to compromised websites, suggesting it's designed to lure users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is structured as a link farm on disposable hosting, further supporting a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://bangladeshceramicsociety.com/uploads/editor/files/62352652391.pdf In PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a42c8d31af---7494591785.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/wipudida.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/gagefutesutelumigefemup.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/nozuwifobazekanetelenugot.pdfIn PDF document text
    • https://gestcargo.com/uploadfiles/file/balurixesepolajazap.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/gikiwo.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/65051042975.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134eec41f809---doxusuguwuxuwuje.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/35729558458.pdfIn PDF document text
    • http://freeorden.com/media/file/73300033747.pdfIn PDF document text
    • https://mackbeks.com/files/file/34410691267.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/77b3ee946b0e0b4d3c2eacfe21f01d12/gemat.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c0494223c---41131181134.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/56399417536.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/7843651817.pdfIn PDF document text
    • http://ippon.lv/uploads/File/sopagazavexuxitoti.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/jotapupiwirudeganogesin.pdfIn PDF document text
    • http://sbkf.org/files/files/jedalosukatorotorixon.pdfIn PDF document text
    • http://lse.hu/userfiles/file/35785837444.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210903130737_44z3sj.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/gojajojomozumesa.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/52421056446.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/11071063642.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/gudasejesakiribok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+transfer+large+files+from+android+to+androidPDF 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_off0000bdc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC8 10772 bytes
SHA-256: 0564e1fdb5153a63fc482ceb7acd0a0548efd219aeadd851d027670f1934ad61
font_01_sfnt_off0000d659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD659 16140 bytes
SHA-256: 16b67cf2267b222ae325043360c3316f3b2d71b2c35546b89f6b0fc4f97cc220
font_02_sfnt_off0000ffd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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