Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aa33646b113bcb1…

MALICIOUS

PDF

88.6 KB Created: 2021-10-08 11:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8ead38324d33ac36a631097f051ea9fd SHA-1: 65f74e98e450c00808683c5d77b73458882cc7c9 SHA-256: 2aa33646b113bcb17dd8ebcf9307d59b1f38f2da7d68d0ae34e465236bfdba78
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of using link farms to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=permission+denied+to+access+property+document PDF link annotation
    • http://temple.mo/userfiles/file/kefutum.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/wunalusuzilumalikena.pdfIn PDF document text
    • https://hidropomp2008.com/uploads/userfiles/file/tabuduzifininizidifute.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/gamerinuzaz.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/morevuwawakamekow.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/pofubibunikux.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/31607207004.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/3542090152.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/61315901058.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/66678018748.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/55730519681.pdfIn PDF document text
    • https://pierreseche.fr/userfiles/file/natiwawenobawewubaf.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/peribopotikitojara.pdfIn PDF document text
    • https://tsolisp.com/files/file/82609400872.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/sopikubabivijedifinab.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/89603619840.pdfIn PDF document text
    • https://777mto.org/contents/files/71004278503.pdfIn PDF document text
    • http://analhospital.net/file/files/25596840056.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614427614ea34---54600421886.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/ecse7lgp2vmvkf1qvdbok6c7u6/luxoluzasidixojow.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/zovewupim.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/16459089981.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/22335069546.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/8434d575f76e8915d9784fed28dcf4c3/saluzesusuvezid.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/vogidinenaxakevi.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/77279233565.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/39886555677.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/loxabawatolefofemo.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_off0000e7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001000e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000E 10844 bytes
SHA-256: 0cf10830cbad845bb0a6d5ddb3ccb70657d70aed35618278917f4804ab6587af
font_02_sfnt_off00011923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11923 22268 bytes
SHA-256: 7fa4d89a8c4bcb53d645e8597337076a15cb0af2474a1233093e1cd5f4d26be8

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