Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c0289c8e38e0999…

MALICIOUS

PDF

90.4 KB Created: 2021-09-04 19:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 485e981f61199a71d723128390c910c3 SHA-1: f62a9ec08a553732b7dd12490ed7e3e2cd57f9a4 SHA-256: 1c0289c8e38e09994366f05ce49edfe19ffca9de4222bc7bb757d2bcda5d8f00
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of external URIs and link farms on disposable hosting. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://smidgel.ru/uplcv?utm_term=feedback+control+system+charles+l+phillips+pdf PDF link annotation
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120c60a8c3df---39278477897.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607883519e2af---56269036567.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/totasinemebofisozunominad.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/cot8q461ipk37vo40u6pnul0es/gisil.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/77710850578.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19312912842.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/19970602519.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/77730853281.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/aeda50148b1f8438c40511f633ab9d2f/xosifasowi.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098b7e6ec043---naxeporanavol.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160739c4e96d02---duxuj.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/sulajef.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb48454e287---80865643063.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/motikuneloxaxitijajilidit.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/pipabikewoz.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609049bca56bb---55833034970.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/a9c05a6c62fe59c331b8a58a7ae3c09d/76121571689.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/48571351755.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f2623a708---nofamowokugisenelarom.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/dezipexidito.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_off0000f875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF875 11208 bytes
SHA-256: 06dbcad31696ab0d722ac9a9757dccddc0b2230b10315792ccdeb46807909898
font_01_sfnt_off00011247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11247 18864 bytes
SHA-256: 193ee5a0e95bf3e51fbcfde747d2c5100ae04c540d3fa7d4de5655bfcee024b8
font_02_sfnt_off00014389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14389 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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