Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cc214f934a76cde…

MALICIOUS

PDF

113.0 KB Created: 2021-07-07 01:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ae4fbef934f2e7ae6967c060dcea24bf SHA-1: 920453a9c45bc2862ad0a066db87043bfab00176 SHA-256: 6cc214f934a76cde2aacafd48e429cdf87c9aa92ac8db9cbc6b754fcd092c951
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting sites, indicating an attempt to obscure the ultimate destination of the links. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URIs and compromised CMS upload links supports a malicious intent. No scripts were extracted, but the structure suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://aljuboori.com/userfiles/files/46164777675.pdf In PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d9c51f87686---45524131614.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/6546832540.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/venajatizikepin.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/51134361759.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/85102427929.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16096484c7cc6c---kitowudefudibepira.pdfIn PDF document text
    • http://ebanksunited.com/clients/7/7d/7da19d52c1086e69e61582739ce98a0f/File/33298525204.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/japalutopazarewefinoz.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c97f881d1---neduludenudeba.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/d6805c4aca1b9c417589f370e60b1959/27715861875.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/6315413f327e179ed5233ea810a00afc/76204773212.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/jebowonakabetigita.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/wifijobifipunolovozelokin.pdfIn PDF document text
    • http://wagnerfamilyreunion.com/clients/866685/File/vofuxoda.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c6b79e74b---24560876675.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/kalumakavavanaripewe.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/hkusstdbm4nc6rg9eh8u36vl16/99260833610.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/e61c824c12bd2d03999aac81b2db6747/58494980149.pdfIn PDF document text
    • http://www.moyekolodin.com/files/xokoxude.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1104307c9---17611159670.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/894jtr7hijc7en1rr7roo8t42k/mawusagefadepinobutoxana.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/89987030713.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=three+phases+of+matterPDF 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_off000154a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154A9 10344 bytes
SHA-256: 89a0320d32f1ad1f917bd39253d21e1c8dbf99d93afca99e8932e711839f78f3
font_01_sfnt_off00016c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C0E 18620 bytes
SHA-256: 18b547f2dcc95a7c7bf6c6e2e829d61fe45fb8281849d9240c835c815206002b
font_02_sfnt_off00019d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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