Malicious PDF — malware analysis report

Static analysis result for SHA-256 df467ecb4f0db84c…

MALICIOUS

PDF

84.1 KB Created: 2021-09-01 07:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: af42937aff0b467674e3ca6baa2d8e65 SHA-1: bb9765ee3b1a3bacdb9d19f7675ef551413f9c6a SHA-256: df467ecb4f0db84c4d045aacbc34125e18460c04d38078f8e47fbeeb1526c017
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The heuristics reveal it contains embedded JavaScript and a significant number of external URIs, many pointing to compromised CMS uploads or disposable hosting, forming a link farm. The embedded JavaScript likely facilitates the execution of malicious code or redirects the user to these external links, which in turn serve further malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://archism.ru/uplcv?utm_term=subset+in+dbms PDF link annotation
    • https://www.zolmedis.lt/ckfinder/userfiles/files/87698965965.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/tuvalujorafemabebelagu.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210509152200.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/52194100826.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/611da1d90b0dab1dc8c332a2c6d15c21/50374894852.pdfIn PDF document text
    • https://panama4d.com/contents//files/55649208743.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/sukofakotorobomotosegon.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/zuxifu.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/56010322718.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114c8d518107---11970304519.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/92187086137.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c11782756c9---79057725161.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/rewogakovonobo.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/buxumopuzir.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/febadufixuwubalekezolas.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/ruvatuwexopefite.pdfIn PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/takogakavipureda.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/liketukolajobujejewemod.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/2643895452.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6379918cd9---bodadosuvid.pdfIn PDF document text
    • http://thebaileyfamilyreunion.com/clients/6/6f/6f45d7e5c9279c15d0bd3a3fa6949618/File/46836075468.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/a1c9d80f3f0d7d8725c2aeeeb56f55df/mumivemumewep.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/19bc248e07f5d1b8b6078961afe8a010/vulimuwefi.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_off0000e248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE248 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5A 18076 bytes
SHA-256: 20a073916a825960bce1a1266b3499028a6e1a64c7512e34aa2424cb7cc3abb4
font_02_sfnt_off00012974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12974 10296 bytes
SHA-256: 139d6fc323a184a6b1de46516e83aad02df120a809fcaa68fc29d5a24674fdb1

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