Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4599a431b7aaae5…

MALICIOUS

PDF

87.7 KB Created: 2021-07-08 09:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b58aace427e8cf835741b1f6a5ab86e1 SHA-1: 50be9d7301a0ab2eb5226b8b99b22d6834e91c61 SHA-256: b4599a431b7aaae56c26e404062c6bb97a9d52ab35cac271714e0baa62f899d9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites, indicating a likely phishing or malware distribution attempt. The presence of JavaScript suggests it may be used to execute malicious code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crewmak.ru/uplcv?utm_term=all+the+creatures+great+and+small+season+2 PDF link annotation
    • http://skncn.com/u/files/jetazosivuzugodufuteba.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210524163200.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/c797tg6kkqmd9h8jukr9grvckj/6702212039.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/547d0e9dd235f76135c3e28c72e02a0e/moxil.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ppl2782gilhkvfmm1dite1seia/13379312434.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/hn3bh5iqr46kkl4pgsh65mtmko/pivebozezapipim.pdfIn PDF document text
    • http://highlandcougars83.com/clients/2/26/268573c5102cd00412bac87cee9346ec/File/23386699008.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/43241111369.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/9160734250.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/65360762787.pdfIn PDF document text
    • http://beateromer.com/bilder/file/11921915566.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/qbinummv865l3tcroe3fsrmgr7/luwudun.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/73028200140.pdfIn PDF document text
    • http://arcadia6465.com/clients/f/fc/fcac8d81e62e7f23ed02b02243def538/File/nimun.pdfIn PDF document text
    • https://mvservice.it/file/34160770032.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/dobulo.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed0d41c4a3---59263769027.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607439f1506cb---gexowe.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/jajizidijetotepojilobi.pdfIn PDF document text
    • http://colescastle.com/clients/875019/File/bajafogoniz.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/bce485dbb281f53b03faf3081dfe7f52/pileguxiwivibibutuwota.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3250680167---puzefumupepul.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/bb50afbaafe291ce78888d0e8776513d/gekeragibabu.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210627115736470283sappzg.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/73964719207.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_off0000f214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF214 17512 bytes
SHA-256: 414086438760df02b38c8d65b151b33b92fa8cbfe5a3d4aa26a4ad6e7384bcdc
font_01_sfnt_off00011ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13813 10928 bytes
SHA-256: b2c8f2af6115968c5d2d84bffde8c4e93cbeeed3f0216611df5890e43f960641

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