Malicious PDF — malware analysis report

Static analysis result for SHA-256 826bd2c9d8578eab…

MALICIOUS

PDF

86.4 KB Created: 2021-09-05 14:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 60eaf8831d24fd7d552cabc7ae6cc609 SHA-1: 39b678ec11d303fe16e94e2b1e62b0561922ece9 SHA-256: 826bd2c9d8578eabbad314bcf2bee45714757eefd962661257b1bc024388cb6b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware download sites. The presence of embedded JavaScript (T1059.007) suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/2481e47c210cfc4506601d320dcc8805/39859602863.pdf In PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1609c76ec8b316---pojetixurato.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/95035665510.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/kubapusuvirunedadis.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720c717dea8---63247517486.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/5kbtjqorlnmdq3qmb3iqecr762/powojalugofuxezo.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/27328074650.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/jupodukabapirafi.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/48382590530.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/6517301541.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6b289a649---xigofivukebida.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/96819838150.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/4c31a62c3a979e047a4df0d04b00a712/2333249051.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/panazoxosilumapode.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/ce7db215acc5e06d2e402e11e460eb2d/42513776140.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e4c000ac9---xodigamizinoxoxepotevexu.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/warurutuvokamumusosa.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/fd37c434b0dd88e7da968a24b7f63dd7/lagojezewab.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d79c4c248---suramerapokazabakexov.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04efbe0c31.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830c4593381---21608811169.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160f3cfd0ed890---momudajeva.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/25079812875.pdfIn PDF document text
    • http://lawngo.net/fckfiles/jifololigesojuxetepix.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/wotuziv.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/giruxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=procedural+text+comprehension+worksheetsPDF 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_off0000ec9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9F 17572 bytes
SHA-256: 968d7ebd07d1bcae323b35566dc24b14be0455b3f0724c846964b47ddd1e48fb
font_01_sfnt_off0001199d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199D 11160 bytes
SHA-256: 7c1fdc8edcd40ab682c12100a3dacafc3f857a4cd178a214f943b112d68d5405
font_02_sfnt_off00013392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13392 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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