Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e7df3d5619406c1…

MALICIOUS

PDF

75.2 KB Created: 2021-09-03 09:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 582b51bba8c0847b0c2f0d14733dfe9b SHA-1: 4da4bd5db2b566055a7107e5fce6e945f25f1a3d SHA-256: 1e7df3d5619406c10a8fa9958304c06cd7bc3f486423e5e9bd4742f6198412df
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to external sites, some of which are hosted on compromised WordPress installations. This suggests an attempt to lure users to malicious destinations, likely for phishing or to download further payloads. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://urduhadith.org/survey/userfiles/files/61386855135.pdf In PDF document text
    • http://interiorconsignments.com/media/file/gifiwivepaput.pdfIn PDF document text
    • https://rosycaffe.com/file/2511284424.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/30298112225.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/63706952477.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/18b5c2163762497dd56c46bd1fa37585/2860388292.pdfIn PDF document text
    • https://agrolliance.ca/ckfinder/userfiles/files/24988584535.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/bf4ef5f4b964cc0eef01a4e7111a7b5a/tosigalixusegejox.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/32950674094.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/77490786178.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/e225b1c5f3acdae1cc369781ca0b5fc7/86024197893.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/zatilopejimizo.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/b0844246fa86443d4e3273912c8c2ad7/94075091345.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/110841284.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798d92b4596---69709892381.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89305ada0b---gixileneli.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/56e4db5a7ad56921167bdfeb60d6047d/nalibodunezafanu.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/67632229116.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/sipofamijokexov.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/87399709967.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b734bac461---92078214029.pdfIn PDF document text
    • https://bnovum.hu/downloads/lokopofoxewilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=mathematik+neue+wege+2+arbeitsheft+l%C3%B6sungen+pdfPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/39411211109.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_off0000bc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC8C 18224 bytes
SHA-256: d89e5ef9390b9ebd17fed4b3b13074b1df7a374b7f3075baec675bf1592fba3e
font_01_sfnt_off0000ea15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001022c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022C 11568 bytes
SHA-256: ab9d621f955a9b19baa557d2795b948432e7d5d8bdd3c27635089b07c979c530

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