Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4b83729869e752…

MALICIOUS

PDF

84.3 KB Created: 2021-09-07 00:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ffa3dbf2fa850f7b02aa7bfd343453c2 SHA-1: 3f889986dfbffb96f25bd6c7e6dee44fbebf00b1 SHA-256: 9f4b83729869e752291e49e26f3c2a7171eb34489bfbaacc7af45b1b85edd8a0
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users or download additional payloads. The heuristics indicate the PDF functions as a link farm, pointing to numerous compromised CMS upload directories and disposable hosting domains. This suggests an attempt to manipulate search engine results or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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 http://grandrosso.com/js/upload/files/navafelavimowu.pdf In PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/xiselojafuximesadi.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119917ecb766---68391286572.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b22d04ba314---49221077101.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/9199b94749201745dd638988d21f77bf/89939157516.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa380efc77---bovonerijuwonibunaz.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/22673312421.pdfIn PDF document text
    • https://monyetjoget.com/contents//files/45682221412.pdfIn PDF document text
    • https://novitas.ro/files/59284848096.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/bizovetonotetotavojanu.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/7978005f0e32b186454245683bde6236/46473514616.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/47809532193.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/43769480645.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087cca9884d7---tumogemesibuvifalizizu.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/6ea3eeeac67856860716088b7b2b9e85/23453466781.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a0aa7494fe1---22966190678.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/jefekowiwa.pdfIn PDF document text
    • https://cartolmania.it/file/mopumikobuni.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/30361577231.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/golaluxapuvak.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/cfff1ba65d3e7cbbb274d29b0095224d/lokobebori.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/fuvutixigemabo.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/poneruzisagijepabovun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=honda+pilot+2010+repair+manualPDF 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_off0000e4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D7 10772 bytes
SHA-256: c10daddf076d9cd2ae6deeda29d18ec72eb4e63d3252c73509ae3a563285135f
font_01_sfnt_off0000fd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AD 17504 bytes
SHA-256: be2b549ff61a934019e325a791c5272901c593fa2a609a29342c215a80afa454

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