Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dcc8ba18b8c0ab0…

MALICIOUS

PDF

83.6 KB Created: 2021-09-04 05:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 5d2fb9d19de9bd9ce8f4162d9aed9c4c SHA-1: b3c74c0f1af15f147c9d080ac36cef9c5b81cf60 SHA-256: 2dcc8ba18b8c0ab079cd5a8524ac124161951870beabede732d1127a0cd40544
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tailormade-sales-marketing.com/userfiles/file/buzuwixefifuz.pdf In PDF document text
    • http://cristal-in.fr/userfiles/file/86507635370.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ad9c119e4---wokezunuxibuza.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/58749713857.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/mqdk1mledfddg9iq8v4n6rmea4/27134554359.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/sidamevapetisuxenuduw.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cecc16879c---94274970700.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/161000a7ce43a6---nuzexoz.pdfIn PDF document text
    • https://soechi.com/userfiles/file/foxukaxuwamidutazezagupa.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/42227298647.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/paluramodupawup.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/zefizidimuxafurovunimo.pdfIn PDF document text
    • http://monroehighwildcats.com/clients/40160/File/94810728997.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/nidulu.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/59e5a4b426647911fb333a78ffb775aa/54716348336.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/jodivanuzirikonujonurure.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/mewipuvifi.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/rexixanojepuperemosomivu.pdfIn PDF document text
    • http://allasclub.com/campannas/file/7288756381.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d59c439af1a---bebijijasidavibani.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/41037334519.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/bd41b5f6da768aae526e4af3acb7c66b/pufitupadi.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/75373444129.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/logiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=actividades+para+fomentar+la+lectura+pdfPDF 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_off0000dbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD8 10928 bytes
SHA-256: 15fdee6d131b03ba35524da033eed32bbb687f921020fab2e8ef36cb11c69f26
font_01_sfnt_off0000f532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF532 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D44 19256 bytes
SHA-256: d6e0c4d6a09a3500e100fd43fc59109bf06ece7a2add1dafea3c93bf419810e9

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