Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fcbd8dc94e9679d…

MALICIOUS

PDF

89.3 KB Created: 2021-07-15 15:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3f681bea1271c663d30e6274699e441b SHA-1: 8f346179a51e34106245bb16d198f574c719af6f SHA-256: 9fcbd8dc94e9679ddb1985d672e52f2b80aa14090370c98f1d96ade03ed659ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various domains, including those hosted on compromised WordPress sites. This suggests the document is designed to lure users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://wastran.ru/uplcv?utm_term=vlookup+in+two+different+sheets PDF link annotation
    • https://unosms.us/userfiles/file/28874952969.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/15671996803.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/8ukme7neivotdb6v7qfpb4o33a/lizumava.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/sigimasena.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607dabbe26aac---wukopirabugibopetaweseju.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/fupojofibiwuna.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/10875467306.pdfIn PDF document text
    • https://777mto.org/contents//files/fakato.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/visiwexu.pdfIn PDF document text
    • http://praguetransfer.com/files/file/dakewabubufizovil.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/79940028729.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/pozub.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/9237aacb54693378d64705fbcc50b393/39755908239.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/cdhjud114m84lo74rpmkbd0832/tomawamusumij.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/nutunusadafogusikomivoze.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160b06c50c3d6b---wavojej.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c421865fb4a---61884037780.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/18351762533.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bea1f2ffb5---molaza.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16088495421c05---gotositagubajinavikowur.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/82205426308.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/tumexabutajani.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/bivame.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c460b448706---vorodik.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f8e0ce2be---78368452598.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_off0000f464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF464 18620 bytes
SHA-256: 6132df79c448bd12342f7c7ceed22a7e724a2ac6867ab64bf931bc64f8602a9b
font_01_sfnt_off000125b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B1 10680 bytes
SHA-256: f9e166c8c6565d1fa1c114f40a11b45586b1d608f02717c759a928a7c999de17
font_02_sfnt_off00013e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1