Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5e4a1d58c974dff…

MALICIOUS

PDF

86.0 KB Created: 2021-08-09 02:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 792cefc514d490ede5cbc25f70c61ce0 SHA-1: e43bbf3c5e121bbe92a5b93ab7762b0b7d43cd21 SHA-256: b5e4a1d58c974dff8a0ac01bcea5cc040d68b38143f0e2ed6dba33527f419ada
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, likely intended to trick the user into downloading a password-protected archive. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' strongly suggests this intent, as it indicates the document provides password instructions for an archive. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/ml3joeu0sahg0shq16k46vsrug/ranexukuwopuzonedobok.pdf In PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160999f4a9424c---29934679366.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/wakemiwe.pdfIn PDF document text
    • http://lbhodgereunion.com/clients/3/38/38e1f81cb1ac74d12d86c8ba87866b9f/File/girifopewijogul.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/diguguzusekogepugo.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/bulize.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/6tn0j1lmbvdlrv8f2l7okkkkt6/14615315891.pdfIn PDF document text
    • http://melinterior.ru/userfiles/files/xezisig.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/97338060032.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/21129831887.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/3eca8d5b7a0702722848b1f9f0bd8eb3/2941170539.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160980c4be15ae---lulibobek.pdfIn PDF document text
    • https://spiuruguay.com/ckfinder/userfiles/files/59768768531.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///41885391196.pdfIn PDF document text
    • http://airfa.it/userfiles/file/26029229195.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/gesekizosineti.pdfIn PDF document text
    • http://cauthinh.com/luutru/files/5529959295.pdfIn PDF document text
    • https://krippner-schroth.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073fc6833ef7---jufuvaf.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/92282032318.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/5985039058.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/sokezigamabe.pdfIn PDF document text
    • http://hi-techfiber.com/userfiles/file/mizirazitexopepe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=not+receiving+calls+on+apple+watch+4PDF 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_off0000eba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA4 17100 bytes
SHA-256: cd7778cb9ce16d79b7e21bf65f7e15a034ec2ae245edc47c4973ef3cb77a59d1
font_01_sfnt_off0001183d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13054 10860 bytes
SHA-256: fb933d4698b5b8b739f084b63ac135e1002ca207cf58ff8a8682b0f40ba0a84e

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