Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9bc434423bb6c61…

MALICIOUS

PDF

86.5 KB Created: 2021-07-06 19:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 530eae9b81437dacdb6b39350f040672 SHA-1: fab213bff26ef927348e794e28dc59df1f40fd12 SHA-256: b9bc434423bb6c6143af41fce6aab5ea88eff3b598fd0d4e6f7e54674eeceb5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised CMS upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or conduct phishing. The presence of numerous external URIs and the 'link farm' heuristic strongly indicate a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://transpack-krumbach.de/_upload_bilder/_filemanager/file/zifedakedijotugaxiwo.pdf In PDF document text
    • http://watthaistuttgart.de/userfiles/file/widorat.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/ou2u9147q6qqaeuidihb4ar0t8/tixibabogalevetikot.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abc3294ec58---vasafezorupeziwekine.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093db4f2e054---79621883311.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/fio7pugh3jcfbmascd2sgslgc0/woravepenogasotirux.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb49a3f983---gilitikijuforiwu.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/7bdf30104c93345941bba234e5eb39e3/16774841196.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/9625750b533a00d6336863e3dfc50760/87904986620.pdfIn PDF document text
    • https://cecprint.com/images/file/fipebume.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608665b176877---fururabodibizaf.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbe4c724c8---46601926063.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/6d45f82745642bcc63c643f4a28fa567/napewuduzex.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/233364d90c0d2e6aa3004f51aedd904f/28787502117.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210604/0837178343.pdfIn PDF document text
    • https://x-software.cz/data/file/35941759077.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090707e91bd7---89920512437.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/d718beedaca849ed136f4bc621050ea3/wesikatelozawu.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/wuzotufarin.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c303bab66b3---74034333021.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/bf613edc05e5bde819099813f42e8aad/tikilajum.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cd02da1ce---67032910316.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=cnt+act+section+49PDF 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_off0000f1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E7 10352 bytes
SHA-256: c4e74d3c4b4c11222c0059fd60688801cea8c71e85a3d0c26ad0d3d95aaba964
font_01_sfnt_off0001098f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A1 16332 bytes
SHA-256: d8ef6164062277ede494500edccfa3075d32e654e2ea7ab09c113301273eddff

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