Malicious PDF — malware analysis report

Static analysis result for SHA-256 d83802a0ba53e17e…

MALICIOUS

PDF

89.8 KB Created: 2021-06-26 23:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: aad40e4ec02e3fa71a9738b981c1cafd SHA-1: 9c68414e5d6863d2975b79ac1b3edf780fc6dad3 SHA-256: d83802a0ba53e17e65d48d7393fa34432772ba33614aa1e16f024e75e10e9361
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised websites, many of which are hosting further PDF files. This suggests a multi-stage attack designed to lead users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/134da769cf752f8a7e479ed8dd37ae76/67257782551.pdf In PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/fk0j3fnbsro72837mljgjvacrf/22437071444.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/0j9or97m7m8cku288fplipbmn8/95733657620.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/88294534522.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7ec4769bf---pojixamoxuxoravu.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee13076baf---9191987907.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5d4dd5830---zodewir.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/99938713790.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160820cd224ee9---33684925411.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f09b805c1---gisowulijoripekedesule.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210527_0C19670E60CE0FAC.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c0742d6a6c6---72780358518.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c153241cc---66755417309.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/dffa3b80cb519ce52073ab1b66dc2153/kolikidojedeluxezinidumir.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/t13aank2urredb6sqhsto00o9f/85656068526.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/fujokisolipivubapalodizo.pdfIn PDF document text
    • http://gyobel.it/public/file/67414640828.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/1b611a2c3ad10199479a67b65e59301b/buwawu.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa8ba9f958---ferenelikewanijekebosez.pdfIn PDF document text
    • http://normel.org/files/upload/file/47490144633.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49e51bea22---fawirusolozabigojusozut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=acting+profile+templatePDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/53fc89cc389853a649b5335dfbf891e7/78677291119.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_off0000fbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDE 17024 bytes
SHA-256: 72e0b203cdd639d2a944a39212b783a9cf6121efffc2532470862543bcaa0c1b
font_01_sfnt_off0001285f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14076 10636 bytes
SHA-256: 3d3f1d48b08b3aca90d23767c2792521336705f5d42b9a16d5ad9583128a24e9

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