Malicious PDF — malware analysis report

Static analysis result for SHA-256 084599184a022d18…

MALICIOUS

PDF

88.9 KB Created: 2021-06-30 20:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 478ac4180cb21949400af1b10ba6cdac SHA-1: 20ca2644e392d9a8924d539774e0afe133e84ab3 SHA-256: 084599184a022d188a0d5c4b698e736b8d9479d1ed4da2a7485575d7f22dc177
96 Risk Score

Malware Insights

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

The ML classifier strongly indicates maliciousness, supported by heuristics identifying the PDF as a link farm pointing to compromised WordPress sites. These sites host further PDF files, suggesting a multi-stage distribution or SEO poisoning campaign. No scripts were extracted, but the nature of the links implies potential exploitation or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/vu1332uh2a9nb9obhjj2t0roij/fupawuvuveramazex.pdf In PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d9a9336be---bajomasuz.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/22554206194.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/302b85f1875a06d529de227eb3ffd42d/62511500828.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/24756c202573b3a5ac1488e000200432/kinugiwewijijikag.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cf7cbee5055---18800253006.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/ee8njnrpup9nlchaqg7nl94hd2/12992812744.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/582a4cc79e9ae688d091fb5f37031e21/82007010482.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//32313361688.pdfIn PDF document text
    • https://ptogel2.com/contents//files/88523109852.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/xugekifak.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/vutaxiponowisojovarawasi.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/357b1907626a08d50a1657808966d31f/zubigexiz.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/zavofetupuxuvimowubir.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086c4e99c3f2---refepaxudiruviweru.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d72146aae3f---34947950434.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efae0b4076---74444822903.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/1ecf7b4d5b6c89de84adf96ba2a7b66c/71273337232.pdfIn PDF document text
    • http://didopack.com/files/tabunokijowekuvaso.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/56d9b0c604550691d07ad0aae75f54d7/rurararulujesakiru.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c849136652---kidebitijamawekiresus.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16087f3074fad7---nexedavinitimomifuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=provo+to+los+angelesPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E7 10256 bytes
SHA-256: 32067ad3498d4583bdf037ab93e872d971f3657c296e61ccbfe6ad60eb08cba9
font_01_sfnt_off00010f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2C 17636 bytes
SHA-256: 446b95100574010d50de4f684818d6367bd658d036cdc09e1bf42819cae9d547
font_02_sfnt_off00013d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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