Malicious PDF — malware analysis report

Static analysis result for SHA-256 a79a8abfef4c8b0e…

MALICIOUS

PDF

86.2 KB Created: 2021-07-24 21:40:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a2a8798d5d64230a8f1946ff90b84235 SHA-1: 3b048bfc6c60b6a22e21a3eeadbb2aa02bdc048a SHA-256: a79a8abfef4c8b0ec84ff888ccec3d6578ccb20799c752f1d73034f032e3090a
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, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to disposable hosting or compromised CMS uploads, suggesting it functions as a link farm. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/rugokurexa.pdf In PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079808b6f1a7---vetosuka.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160853324a5857---xozomadifuzijukokibase.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/91997215063.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/gekix.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/28943600982.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/71910027763.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c558d381e93---55195544330.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0ea4d3435---pomuvidofikeni.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/31779020999.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/i48c6j16gr8hor1aentb389hah/gesezafojup.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/9720387159.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/drf85ohv0njjpk8vl1mrer2j24/jotewedadagujosusaluvalo.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/59863919633.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/78443097734.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac1717ff6d---tofetugel.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/71512460448.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160729ece053af---62002870406.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a87e5ea5b17---36323860060.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/87932734123.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/888c757a69a4494129ac26f3c2ec4450/32556275169.pdfIn PDF document text
    • http://co-mit.com/uploads/files/jakugoxemixupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=non+stop+action+movies+netflixPDF 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_off0000edc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC1 17388 bytes
SHA-256: 7f59843e5b9ac40c63d4b3bfd707b469a24cb6d51d869b08702e21a619bbb1c2
font_01_sfnt_off00011ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132EC 10684 bytes
SHA-256: 16826efba38eeacef6905bb762ac45b536339cf487d69c2e27dfee6f6d59a27c

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