Malicious PDF — malware analysis report

Static analysis result for SHA-256 2180ef837784337a…

MALICIOUS

PDF

88.7 KB Created: 2021-08-03 11:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c4e994a8c14ad8ab545d2f4878bc9012 SHA-1: 328cd6762474a6ce10911e42a73ee2b11f335b96 SHA-256: 2180ef837784337a95532a0bb95bb8c150db2065076325468d2cfc954f4c58af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to lure users into clicking through to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://bio86.net/fichiers/79965974483.pdf In PDF document text
    • http://hugslock.com/app/webroot/img/files/devedewoj.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/73226332033.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/58347283054.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/31155311386.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607368b89c4ed---taximoriv.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/92069835095.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/fizumewovapodatipuvat.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/3c5a6c3153d6cbe596b1f40cc6dde20b/vesiwitaza.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/6cbeqhtksc517ge7n52rp452o3/fumorufibudelewonope.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/birodoramawamami.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/fomug.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b437d2607---buturedoboxozi.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/pikomaze.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/nisufawabepotukakalo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072be8a615c7---69145018973.pdfIn PDF document text
    • http://teknis.it/userfiles/files/vovojituxudusixolu.pdfIn PDF document text
    • http://flightshop.jp/images/blog//file/xubirogitobibuvorakina.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/pibekulagofap.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/012b44351dac74d659e2272e9b58286e/lovewuranemizewuzetopoj.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/pagujuzinetazodebomed.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d28fe047e33---46228135653.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/60840895832.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/43777834702ba108d8ea0f2acd327de7/54643253194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=what+are+five+fold+ministry+giftsPDF 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_off0000f94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11162 10972 bytes
SHA-256: bce62a914b4245b76f66db7ae21099aae68169bca6f67fc9a562b731ceebf782
font_02_sfnt_off00012a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7A 16688 bytes
SHA-256: 318745cdf17e18c69585789daea0c2dedda7d0569348952dc1a09df623a572de

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