Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a891d3929981a00…

MALICIOUS

PDF

78.1 KB Created: 2021-06-28 00:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e1daa957e50990cca480746693ef8aed SHA-1: 916f7151680b3a38da641c114acf53d38b7e9fae SHA-256: 2a891d3929981a001da4f2dabee39bcf658bb86901778a1bc928a485a8518512
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS uploads and disposable hosting, with numerous embedded URLs. The document body is obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9d44bf2cc---7193285950.pdf In PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/d8637bbe108a7a68a2d7bd697f104b0a/2254777745.pdfIn PDF document text
    • https://coil.hk/upload/files/noxasabegezozewowaj.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/28137424954.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/5040011130.pdfIn PDF document text
    • http://lowndes85.com/clients/d/d3/d39312ffd46aa2fbcc4e4de04d96a17f/File/85562750373.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/8a7822ca615e7373e8659850bfc9f4c0/31014732728.pdfIn PDF document text
    • http://dgjst.com/upfile/file/luluvikikajebez.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/kamus.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210529202031.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/711274a991ee4eb09eac8018c2adb54b/90375501067.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/vujakevosajojuxarel.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/6fec8599982a64eac379c8d4b59accf8/seperogasir.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/wibukulikakolewizugu.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/xarasonupukutabugi.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/17416200806.pdfIn PDF document text
    • http://446888.top/userfiles/file/famunoga.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccaf742609---julita.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7d6543208---ziduresetotarewupotorejow.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa6d1a9c51---31134100910.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/fideteluzewakivesogojokar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=stone+geary+indirect+utility+functionPDF 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_off0000cae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE6 17780 bytes
SHA-256: 622b57bd30f91340dcdf4a9a4c144566b2753c2a6dc455241b45560e3427cc59
font_01_sfnt_off0000fa52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11269 10772 bytes
SHA-256: 78c0b081488230b108fc3698d8532eec774d68792ed9f05fd39723a9aa1c20aa

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