Malicious PDF — malware analysis report

Static analysis result for SHA-256 54f5ac145cfccb91…

MALICIOUS

PDF

69.6 KB Created: 2021-09-04 06:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 92884f0151327eb143435d2f02cd4aea SHA-1: 7d066fe5f5d918cad74ec1d07fcbf712558b76da SHA-256: 54f5ac145cfccb915cc7eb1f25271420c5db2ea3d0529f09dc916b20af043b01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://smidgel.ru/uplcv?utm_term=maths+worksheet+for+class+5+icse PDF link annotation
    • http://phonphangschool.com/upload/files/65211505180.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/pojedatolesejovu.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607080eb7dca2---gobixebidonolivalopejorur.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/nuduxubigimenunavigudosi.pdfIn PDF document text
    • http://proxima-design.cz/files/file/joxajekirovanibikomito.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e01579b7c2---tuwofitibamuku.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/sitavuzenamefuvimat.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/davufawedez.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/37230724623.pdfIn PDF document text
    • https://purefeeling8.com/data/file/87053617415.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8235be9333---nesovilidojulegekinovu.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/f3990977fd30c8cbfbf40daa489882bb/65923534432.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/gelejawokog.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/1494909873.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/60999414903.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/bopurisijofufod.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086543cdae1f---gifasanopewepuxorukuzu.pdfIn PDF document text
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/57274209509.pdfIn PDF document text
    • http://nfc.soo.jp/file/23220209922.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/7cb2f39d281ece5120df7e48262d3f48/93877806469.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3fb854dde---13964951812.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/pejibisimulesesojasejovur.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/nozulolefof.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/jefopuma.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109030803129190.pdfIn PDF document text
    • 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_off0000b3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A2 10632 bytes
SHA-256: d2b79d2bc18b57b8a83c9deb352076cddf1e9ecceb547af5b8e719917a1b3513
font_01_sfnt_off0000cc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE451 14692 bytes
SHA-256: 5e4bad920c913c5adc58686c3b77eeba41df2cf3d2ec1223c144d324251fc389

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