Malicious PDF — malware analysis report

Static analysis result for SHA-256 83115028f3a0453e…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 04:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d893985551172c8a5b1acb2f343a4099 SHA-1: e2c96a9ad3d0f7db3627e81cd7db0e4bf719739c SHA-256: 83115028f3a0453e32ee1b8c4041246fecf84bbcf7785bcf9db72e699f1fe347
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier strongly indicates maliciousness, supported by numerous heuristics flagging the PDF as a link farm pointing to compromised WordPress uploads and disposable hosting. The embedded URLs likely lead to phishing sites or further malware delivery, as suggested by the 'utm_term' parameter in one URL, indicating a potential tracking or lure mechanism. No scripts were extracted, but the PDF structure itself is designed to redirect users to external, potentially malicious, web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://irlanc.ru/uplcv?utm_term=oxygen+metabolism+pdf PDF link annotation
    • https://sibois.eu/userfiles/file/gefilojazagavo.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a93f421dfb---11317832585.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/99588901009.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/7266206234.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/wudegitomabinovojuga.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/gvfp3ekq68vmuvtf3pirikfsu5/libanigoxavapo.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092385dcdbfd---kiwewonuwenemoxe.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/17603572537.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/5b562fd8aa53fc17cb3ef7f30930b231/96926770584.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/4g3uspet54tadref5b57slg648/83263442046.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082398943223---paganikepuvalaguva.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/37211833385.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cb47977cfed---dijurimidulujurubalezi.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-8-21/20210821170537272118.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/11906631969.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/57063282410.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///49099012003.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/eca9582f9b01df07d3d117c40202360f/99275633539.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083190705763---gawazobeselalosituketoj.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f3d3bb89348---48969897130.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/92833bf1333b0adc98e43179c4c366f5/99858328063.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/0287c65087997577c1c88cb8d1c86741/80717472122.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef2b3b6d61---vezegajobilozufosofi.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/f2d1d909231b3092fd7b6e8ac712c5b3/73924285989.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_off0000db76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB76 18684 bytes
SHA-256: 0562e2042a296770d37cab88f6d17401f1a9e167d9fff0fb71c747fbbedcfba6
font_01_sfnt_off00010bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF4 11120 bytes
SHA-256: bf6a03273794075585290fee780549b057a11928e4e7fb4bf8d975737cdf5cff
font_02_sfnt_off00012591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12591 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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