Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac03efb1bed49446…

MALICIOUS

PDF

77.9 KB Created: 2021-09-17 07:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d901f7e64076d29ab2f401d3f7685061 SHA-1: 1415cc4fc0d0c8117673a77f7b3e71730349abf8 SHA-256: ac03efb1bed49446f7b17883520f9ce5f7ededd406d3290f2e4b380bd0290214
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a link farm, containing numerous URLs pointing to various domains, some of which appear to be compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs suggests an attempt to redirect users to potentially harmful content or phishing sites. No scripts were extracted from this sample, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://huntic.ru/uplcv?utm_term=how+to+get+free+uc+in+bgmi+android PDF link annotation
    • http://olymp-kiev.com/temp/fckeditor/file/73683248110.pdfIn PDF document text
    • http://midospa.com/upload/files/17275034136.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/03c95e6c049044be4b5697e5c572bdae/27999116272.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/14283226700.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/15352426219.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/40011307428.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/35273173275.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/tr5ghpcqgq2umpqg1in3fv9vk1/12332962925.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/nawubas.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/pojug.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/12464467921.pdfIn PDF document text
    • https://polandpools.com/contents/files/siwugazab.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/79125343137.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/73613914195.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/78369809803.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/musurusabajimopusif.pdfIn PDF document text
    • https://cartolmania.it/file/82074869478.pdfIn PDF document text
    • http://ccadl.com/files/20210911140005.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/mamunujazigeji.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/22d1b66cb2eb119f323abba6f9a7fdf8/rotakomipofojazabi.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135e11781348---farujeje.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161426ad26b43e---gufiwekenuribojigel.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/21mbvb6ord96mjv0t74k3oj8uh/vagosexusisu.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109122025026498.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/11421190321.pdfIn PDF document text
    • https://badrivishal.com/media/soposedelusig.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_off0000cb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB01 10924 bytes
SHA-256: 9c84d38d4e7fddb13e81793fe649aee267142706452c9a5e5d9fc696beecb590
font_01_sfnt_off0000e41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41F 17308 bytes
SHA-256: 22de1f2435b162b57c3482f8fc47acab09de70918187c63f3d987f37882b0f1a
font_02_sfnt_off0001113d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1