Malicious PDF — malware analysis report

Static analysis result for SHA-256 fad933df468a04f1…

MALICIOUS

PDF

85.1 KB Created: 2021-09-05 08:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 06ce594f4762876cec2d071fb8d82841 SHA-1: 593ce27422859d4ceadf7c4a9823b6b63f8cb37e SHA-256: fad933df468a04f1050b054797e012b776f8e77f7ecff4a3e09567d62725e0c1
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable domains. The presence of numerous links, many with 'utm_term' parameters, suggests an attempt to manipulate search engine results or direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://otelm4b.ru/admin/ckfinder/userfiles/files/91620232034.pdf In PDF document text
    • http://szentdorottyapatika.hu/files/moviruwizixitemetexonaf.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/mopatuvimalarebutob.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/81557372777.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/99344011855.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/20202139540.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/93d103312f764c41c3d4f211eb2d714d/vigiguma.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/nininuduro.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607585fb6be6a---vigedatipuwa.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/fokegigojokugobupaka.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/tomesuzivilejagoxodene.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/22336604481.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210814_9CDFEBD8DF8D0111.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/81022426639.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/98891641946.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/zigebenukixujo.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/55181563048.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c2bc190c8---jikonokegi.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0c9f3f7b2---5717472755.pdfIn PDF document text
    • http://muszempilla.com/files/file/gosozanuvatadokivore.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/30e4e752b99b92b4b3cae69c7500cc1d/tupifa.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611447e38f8ef---rugetokizoba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=curso+bautismo+cristiano+pdfPDF 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_off0000e3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A9 19868 bytes
SHA-256: e406b81e1856930b2e4a57bd5850c157a937ef0a497402caf686636260b2271f
font_01_sfnt_off00011603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11603 10872 bytes
SHA-256: 510448e7362460dc7a6106dda8b7e592295dac1229468d6ec5c1d9f0da9deb39
font_02_sfnt_off00012ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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