Malicious PDF — malware analysis report

Static analysis result for SHA-256 087595faac8cbb51…

MALICIOUS

PDF

86.2 KB Created: 2021-09-16 16:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 89c4f4f9e6c911edaada8681d512c864 SHA-1: 8debed32d78a838a156d9fde503f424a43f56c6a SHA-256: 087595faac8cbb5197d810d1c0dddbb032a0cb901aefea2ece36371458a642b2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or redirection scheme. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

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://huntic.ru/uplcv?utm_term=samsung+s+21+vs+iphone+12
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161408eda8e5bf---fitep.pdf
    • http://aqcorth.specialty-match.com/upload/files/fosasiluri.pdf
    • http://artwatch.ru/userfiles/file/dipakajur.pdf
    • https://www.tamilsaga.com/ckfinder/userfiles/files/bivafabomelunuf.pdf
    • https://nieruchomoscikomercyjne.co/files/file/wowexudozanex.pdf
    • https://mjrspot.com/fckimages/file/72939550763.pdf
    • https://cafesca.mx/ckfinder/userfiles/files/11577263132.pdf
    • http://iqlacpro.vn/emotive/upload/files/15192564851.pdf
    • https://charterfori.ir/basefile/charterforiir/files/momivaratizefawog.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f996e43f2f---49683148704.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdbee8f019---51274006711.pdf
    • https://landi-bg.com/images/file/pipopojozolome.pdf
    • http://perchegouet.com/ckfinder/userfiles/files/15985473132.pdf
    • http://asirakademi.com/resimler/files/zofito.pdf
    • http://batterseataxi.com/survey/userfiles/files/86049318574.pdf
    • http://bugaboo-buffalo.eu/UserFiles/File/83630884686.pdf
    • http://ipea.kr/userData/board/file/tofakusixejonenivefar.pdf
    • http://masterkontroll.hu/ckfinder/userfiles/files/kiwajavenedezele.pdf
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/mawenigi.pdf
    • http://seowonbattery.com/files/fckeditor/file/82047250461317ccb66b50.pdf
    • https://hagabb.ro/ckfinder/userfiles/files/bofofimiwela.pdf
    • http://dungcubepgiangtrinh.com/webroot/img/files/nufupemobijanufotakuwip.pdf
    • https://alusol-kw.com/ckfinder/userfiles/files/wogek.pdf
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/37851146915.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb87.bin
dd9bf9a85d25c39962a5bcba81b4611522b9ed8f68f18600a1cb1f02ad7c57e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB87 18020 bytes
font_01_sfnt_off00011a7c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7C 16792 bytes
font_02_sfnt_off00013293.bin
b8177c86321304a7a7ad6016b4433bbd83675cf3b91166b12bb4b3da522c264f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13293 10868 bytes

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