Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef58e242faadee2…

MALICIOUS

PDF

80.6 KB Created: 2021-09-02 04:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 715ca5fd800367c87bafe0f820f0a1f0 SHA-1: 76a65373651561d56705dcb93bde9961e809bfbb SHA-256: 8ef58e242faadee24d7b90dd9ac07d3f7dc8b7dd249117dcd1eb8c367dc2673e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or redirect users to phishing sites. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs supports this assessment. No scripts were extracted, but the structure and URL patterns are indicative of a malicious distribution document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://drafthe.ru/uplcv?utm_term=need+to+laugh+quotes PDF link annotation
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/esed6151s3v2dd9uugeqal253v/pabowubazuk.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080c0a34102b---90863161363.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e40130740---baxijorosimi.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/661be8f112bc7204ce793601a3ff6cfe/fizoziri.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609203c570cc7---vobolimesaterajunijibe.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b467e14938d---zefigituroredixu.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607826e605355---61899280415.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/43708894101.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210629215407.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/36ps5euh8uk9oblj640980efj2/18212463369.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/61403941891.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/fagubeneve.pdfIn PDF document text
    • http://abwrva.com/uploads/files/wudikogavobojav.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/5336059869.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/36377699352.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/50c000e2778f46a98cb65701255ead76/21405650121.pdfIn PDF document text
    • http://rld-carbon.ru/file/196620965.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/93839388597.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/7fcb9460d06a3d04d7f4d16fa5025473/mupegajosavokixibu.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b0516167b25---nifikedikujutarilokosiz.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/823246909.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/pifisefabuwu.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/bizidivixavax.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/87036398843.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_off0000d7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EE 10456 bytes
SHA-256: ad57fb8bcff7b05ee384b196a69bbfa94425ee83fcb46291a37140be850fa209
font_01_sfnt_off0000ef4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4D 17136 bytes
SHA-256: 01de411b69bb40d667aee459a02ea3c9a2e8d4cea41cb7fc264f6bed0f1988fa
font_02_sfnt_off00011b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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