Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d1f85d9d9b45e9…

MALICIOUS

PDF

87.0 KB Created: 2021-09-03 23:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aa0d46f1568be781db6ab72fe9aa23cb SHA-1: d57222086863fa389e5284ba429ca2679237d6dd SHA-256: 19d1f85d9d9b45e9d568cdc46aabb497c7f230b2cb4862edd4c473dce5fced2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious intent to lure users to external, untrusted websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://cokhiminhhien.com/media/ftp/file/82951169992.pdf In PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/laxufexot.pdfIn PDF document text
    • https://serini-cloud.pl/uploads/editor/file/ranavuzefabebuvorovafepi.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/nifubapitasuxozemugedu.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/26418272327.pdfIn PDF document text
    • http://northcity.rs/slike/files/65752636660.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/518be800147f0bdacb43f28eef821204/70264485269.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2a949ad9c---65337200120.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/metiwunivamisudupapetes.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/gawapike.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/wepewawenig.pdfIn PDF document text
    • https://aneri12.eu/res/file/10163536047.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/wotujajidenaturalud.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613223d011aba---41271848918.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e630acdab11---biwarupajigadav.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/087f07a39b15ed074844cad40b187b23/tedub.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/226ec2a82f86d715002ae338dfd69827/jivemakakujijosaneguwe.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/wosetabu.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/juxedolazumiwovomaluboxot.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d2936061a---43322050695.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/3dc823d474386ffb52b3debccf21dbf7/lifimidagupifo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=estimating+measurement+worksheets+2nd+gradePDF link annotation
    • https://lapdonline.org/file/917941072.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_off0000eeaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAF 17736 bytes
SHA-256: 0206338b5d2e76634d7f49268c7e81599d138d7d3a1eca9149504cb19ea28a96
font_01_sfnt_off00011c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C99 11028 bytes
SHA-256: 486104c60675166a47fde58405359ce752e2d3c05e78e57926db7d846289ff03
font_02_sfnt_off000135f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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