Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e8d6d875f9fec6e…

MALICIOUS

PDF

85.2 KB Created: 2021-07-04 05:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2dcd6f9dd028f340cd34fd18acec859f SHA-1: 45b4cdf9f785633fb63f6ed3d1c78441a9e22a21 SHA-256: 3e8d6d875f9fec6e1aafb761dc848247d88735478d9291e313ddcd11fc99034b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://beerskiboot.de/img/upload/file/mapisefuwukiguwozalumiv.pdf In PDF document text
    • http://dzbnf.com/upload/file///zewababekejale.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/49167510005.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/puwezitis.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d06138b67---67455751328.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/mijadogototeze.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1607d47e34a944---32623936051.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/23679894740.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/mixubefepodokukutug.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/9vueh9s24331vhspjpco71e9dv/9873663526.pdfIn PDF document text
    • http://patroha.hu/file/53754603111.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/ed3fb45aea57df1b0faf28bda993f644/6071120822.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/f36654090df11a3680bc41246e609a68/26610438750.pdfIn PDF document text
    • http://shadesvalleymounties1969.com/clients/868959/File/rojijafex.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/sifutulamorujono.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/71pg9j2n9e2k42s5u95vk3tcl0/23323713733.pdfIn PDF document text
    • http://snsi.jp/image/news_file/57089459803.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/koziwufewuxiwezaro.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/f7065632408f4f7a027db251e58f552a/jumirokubuzigibutal.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/zorapi.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16090d230159f6---62985305432.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/69937800030.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021062107120773499.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/3121333296.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+meaning+of+skillfulPDF 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_off0000ebf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10403 16728 bytes
SHA-256: e25a0dabb73a40b81fb6d0ab3b125d014b3cd5aed6b2421b7875ed5d926ed154
font_02_sfnt_off00012f85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F85 10620 bytes
SHA-256: 0ebbde1aafea15eb7fd4160139c7af8c9dc9840d138cecbde4f5caf3c7b964ea

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