Malicious PDF — malware analysis report

Static analysis result for SHA-256 d497b895f6e41940…

MALICIOUS

PDF

100.4 KB Created: 2021-06-29 13:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9ffab467bca2a09b1b71dd326a7a2a96 SHA-1: 68f85a38f8ab9f05f8e85ebdda7d4d0796ec7a0d SHA-256: d497b895f6e41940edaf952df9cfbf2ed194139748b1bd7679b4325d34d82aa1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It contains a link farm pointing to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics strongly indicate an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

Heuristics 6

  • 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.
  • 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://catamma.ru/uplcv?utm_term=mediawiki+extensions+pdf PDF link annotation
    • http://montaze.org/democms/userfiles/file/43189396246.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/rozikuwavibe.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16077ca117422b---63576389044.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/22337088544.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd34c229da6---34548404591.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b52c4fbea---kirusobuvawaz.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/nagaga.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/kipuwejogatigino.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b5610d9eb90---34875856862.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/wufedikifubirur.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/90683684637.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fa2c7c9f6---jetovoguzemo.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/rarusulipodaw.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160baa0c4649c3---rosopemexanowezunex.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/bonugigafikifanogumelimu.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/8933380e17ac374ee89a3bb834b598c4/fedawikiguwatojata.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/jasupexuzifatanox.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a47918b8f86---59607246907.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/midawokizowogalome.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/vuwipifovupikepuwowufu.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2968981953.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160996a02ac0fa---29898403255.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE893 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AA 10620 bytes
SHA-256: e70b1007cfe55feacf12611f48ce4166cae017a68a2e13dcc132e6d7c8734c61
font_02_sfnt_off0001192b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192B 18148 bytes
SHA-256: 127076dce4eaedfc55942b163ad485452e977879809dcca4743959539063c124
font_03_sfnt_off000135d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D6 23384 bytes
SHA-256: e4112874f971083ad4c2e4001f283556db04b3aa900bedbdf6a1a1f7699f7348
font_04_sfnt_off00017017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17017 4988 bytes
SHA-256: 93d1eaabd9ca8f20c980f3860ae621b2b57544ed6ede43c995e9aec39469cc81

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