Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d75b72faa7e0f2e…

MALICIOUS

PDF

89.5 KB Created: 2021-09-06 16:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 16dc052805a777a742de718d89b99cc5 SHA-1: f6dffe2f91b5c232ff2b6b81be80b1cd29cc5ea1 SHA-256: 7d75b72faa7e0f2e86b666d5f861c014d1bb52532f654953ee91dc4e81a77cc9
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to a variety of domains, many of which appear to be compromised or disposable hosting. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to direct traffic, potentially for SEO poisoning or to host further malicious content. No scripts were extracted, but the overall structure and URL distribution are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://queure.ru/uplcv?utm_term=code+de+droit+international+priv%C3%A9+belge+pdf PDF link annotation
    • http://ipmarketing.net/userfiles/file/rixom.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/61054146873.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/xoborif.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/npbhu5fenc45g2sjqgue2shhp6/falaboka.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/wixevejezijokebi.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/safatakopinof.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83138b0aef---78323996054.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/xolomiwimudinavaba.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/75337727917.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/nitiwamamew.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37798719149.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/7500908834.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/sgkskh3h90dkdtsufk8sic6mub/56316985004.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-7-17/20210717100107309219.pdfIn PDF document text
    • http://theponghop.com/upload/files/fafujamexigatu.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071afd74e78f---83444993681.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/22371508920.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723681c5104---gatikemakoweri.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/7e4403c09b526132f52e30ec7268f884/mawog.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160744bf6d0d2e---sopekonowifegunuv.pdfIn PDF document text
    • http://southport1969.com/clients/861680/File/63194057505.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a4a407720---46055327792.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/3a2bb095e9330c7378fc87f47375907f/togituramisajinelanujip.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/36812755100.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_off0000f1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BE 20796 bytes
SHA-256: 6bcf9636fcf54b34f65ec8051784a83757bd3669c9e2fbb45280b0a70c4542ee
font_01_sfnt_off0001255f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D76 10896 bytes
SHA-256: 16b9c530a97963a4468c51aeac4797766ac2dce86d5fb42da24e712029c5b935

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