Malicious PDF — malware analysis report

Static analysis result for SHA-256 8de381cdd2309ab0…

MALICIOUS

PDF

79.6 KB Created: 2021-09-01 05:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0556e5ff050e3e3c483e2627c92a9ce7 SHA-1: cbb6f1ad6f19762b384aa2adc5eb361cb76dd6d4 SHA-256: 8de381cdd2309ab095fb21329907f850c26cfaf2548fdbc649e9aba2f70d3710
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. It contains numerous external URIs and links to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the overall structure points to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://crysiq.ru/uplcv?utm_term=blame+for+me PDF link annotation
    • http://rapet.hu/files/bapimomobozojidapugigel.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6be0afcf9---72294781594.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4084b7c9b---84827612204.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/1217488000.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/kilatopajejasigu.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ef43445bc---73151720943.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/betodagikozika.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d9c25d3c6c9---88734029151.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/62044774099.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/67409347307.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/68425381649.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/51482356508.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/wurativuso.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/67655516757.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6c5b97445---81327797846.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/30e5d50064839149f5ea0ae546398833/watipub.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7ec4769bf---pojixamoxuxoravu.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/47769808777.pdfIn PDF document text
    • http://scottleddy.net/clients/862555/File/wenaz.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/fulesojebizolujosojeli.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/7fba01c96dbf238ff087f38f77fda52f/72574414706.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/sojigir.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/tokaluborofuno.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/59747f8f148d30edef1ff8567980ff01/31782963430.pdfIn PDF document text
    • http://hms31.ru/img/file/kogewesi.pdfIn PDF document text
    • http://74ahs.com/clients/2/2a/2a132ee8da0778863662fd4b1fa251ed/File/fivipewuxokagiwifudiw.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_off0000ce8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8D 19828 bytes
SHA-256: 3b004e893efdf9bf25e96fbd6380fe3a9afaeb1e8524970525aa0053a5a9ea9e
font_01_sfnt_off00010285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10285 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9B 9968 bytes
SHA-256: 3c08454703ce7001570062f661bb60f2d2b5e731aac3a5dbf1485e280b391925

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