Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb3e6a79328353bc…

MALICIOUS

PDF

70.5 KB Created: 2021-09-27 16:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9c06e887e0e2c1740e3848eabad02d0d SHA-1: a7f4a7cb245ca97bba5c7a4054ab45e02ea82596 SHA-256: fb3e6a79328353bc9b80af9cddda82bcefc3d47017f5d24a96c3ba3a56ee0d87
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and the presence of external URI heuristics further support its role as a lure or dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://strings97.hu/userfiles/file/buzaf.pdf In PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25039126927.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/midodokujenox.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614146a71cf2e---84258796314.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/4a46b5160a7b9cae53b9957ac7df6cec/texib.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/jimolakorowodibip.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/71761901224.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614f46d0c00b6---movudivijobefavajafe.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd148eef5c---rifumefo.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/zomitokumudodedo.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/43880358174.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/wenepowu.pdfIn PDF document text
    • http://besteva.com/upload/files/zudonuvatozo.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/xagokekafixawupow.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/96225564271.pdfIn PDF document text
    • http://tfforming.ru/d/files/kurutumugazovowawopun.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/zebopomofagigisosusuxa.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/maruzewedawor.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/zanizexemagozivuxa.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/zunenikuna.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/suzig.pdfIn PDF document text
    • http://husplaza.hu/editor_up/24769204513.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/nezesok.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/jiwinifejido.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/maxuzaf.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/17320077542.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=redmi+note+8+pro+firmware+updatePDF 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_off0000b178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB178 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98A 16536 bytes
SHA-256: ad21679a1c222daaf4dc7362cb0a255616ce95be734fec4c69e1accb99cf3997
font_02_sfnt_off0000f381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF381 10884 bytes
SHA-256: b14d73add3d4c4de34300b0df9b8dfc5dcd9e9d7200b174b5038fbd4a3912352

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