Malicious PDF — malware analysis report

Static analysis result for SHA-256 2addbb6651ce63dc…

MALICIOUS

PDF

75.0 KB Created: 2021-09-05 01:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3a40e0bd7ae263cc7b3b234e4ecdfed1 SHA-1: ad65cef6038de835c1af544d2ebc6cede8a6dbbf SHA-256: 2addbb6651ce63dcc9344f41533b8a9653fc6b56f8881b6738714f8e8dd0b3e9
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users through multiple compromised WordPress sites. These links likely lead to phishing pages or further malware downloads, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.democratum.com/wp-content/plugins/super-forms/uploads/php/files/f773f4cbdde2dc1271dc01324fd9afd8/57077494092.pdf In PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888759bdbe0---fegifuxisexadiw.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/160f0620029b43aa93cb33b4c9d8d2b6/duvurekinegexe.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/vetopivuxumosuzobezuv.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/sevisonufamulivaruto.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/26769168043.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/10614915672.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210615050724.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b309bf1a845---rogozo.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021071011343180554.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/35284651408.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/74c4df785761d7b8f8e00bb93f236d58/vikafuboguvuxenuru.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/27255970197.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/wowasekonaropigonizoju.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123738e6d893---80813513797.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/64827814943.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/mtpejiasjmufh82rihtj78lr95/wobedesuzerurevon.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/89735392485.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100295dd9e40---3023683148.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7f9d4559d---69965954069.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/4466bdf77fbdcbef69e2bbd756df8b64/tazem.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/36992041080.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160b380fdc2398---wutitaluxawud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=distress+respiratorio+agudo+pdfPDF 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_off0000bf9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AD 18120 bytes
SHA-256: 5b138445e11ac6621a95f240a688c687b72223b2b23a3e739224a4f61767cd24
font_02_sfnt_off00010661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10661 10624 bytes
SHA-256: c8d09b4f6836b16edd9cf5a6b8569fc97884c34a5dc6ea8a92d57b1f0cd9b86c

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