Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef4419490c1123d…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 02:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 14e402a695c374e6088a4617c6744b6b SHA-1: 9d7af1838a9d411132187072dc2c1fba2fd82d68 SHA-256: aef4419490c1123d8851d434165424df6598a1d5a073bac10f2d0cd39ace7949
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the true destination or to leverage SEO tactics for malicious distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/pebikevixazewuma.pdf In PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/49797551581.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/dozaxu.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/0du756ajklbf6l4oua0uq41mq2/25431035004.pdfIn PDF document text
    • http://laguna.piyawatgroup.com/images/files/51810959267.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/71213529574.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/45843834077.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/7618ed9aa628991ed91f3cfecad8d912/giwakopisebewu.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/54913696139.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/814e577ebdc953dd63d3ef472667bacd/48741907080.pdfIn PDF document text
    • https://krossi.ru/images/content/files/bajusepifagiva.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/20800494386.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450802a19b5---91592912367.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/xikefoputelevu.pdfIn PDF document text
    • http://skupka23.ru/upload/m/64433411187.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613064fea4a90---nowoxafabuguwawije.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/35173118458.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/8321525000.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/49621744074.pdfIn PDF document text
    • http://yongqingtech.com/d/files/saximimosovuzikim.pdfIn PDF document text
    • https://rajakedua.com/contents/files/69265311395.pdfIn PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/xenolilotupares.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/25082695635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=watch+king+kong+online+free+skull+islandPDF 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_off0000d744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD744 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5B 10940 bytes
SHA-256: e1cc80beb89b88422f5dadcb6d7826b40b5c4da336f6d122d2fa190faa99b981
font_02_sfnt_off0001087f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087F 18196 bytes
SHA-256: e9066074aef5f353c327184697031cc63cc6654aa6e13e985eb6d27e757d140c

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