Malicious PDF — malware analysis report

Static analysis result for SHA-256 5121f68b83b7cfb4…

MALICIOUS

PDF

83.2 KB Created: 2021-09-16 04:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 16dc6849a811ed8806cd950eaa56d30d SHA-1: 257817aeaaa65f202f914e0ab9e398bfae48d932 SHA-256: 5121f68b83b7cfb4a9ee5f59b644ec913992912a14cc62702ef8c8288399a6b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to obscure the final malicious destination. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://smidgel.ru/uplcv?utm_term=minna+no+nihongo+n4+vocabulary+list+pdf PDF link annotation
    • http://deleeuwputten.nl/site/data/ws/files/56480240104.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/16005825215.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/38930091153.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/mukimuvipusovimuxapitivu.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/15858986693.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/73b8f7d32e672c507279c6967bfbac2b/tudebi.pdfIn PDF document text
    • http://industrialdevices.in/uploads/retimezawilap.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///91230203137.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/14876064051.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/vobugikidubolib.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/viviremefowadovasajeveru.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/4387570840.pdfIn PDF document text
    • https://kristinanamaste.eu/files/35719046728.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/43210255681.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/94459157320.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/xezagofijekib.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141cc090245e---gemobepaduw.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/toruzasisukavisitovodofum.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef35a66482---24897854540.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/bifuxidu.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/73176132867.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/68368951736.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/29164166020.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_off0000da14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA14 19720 bytes
SHA-256: a09d4518105ef7f8eb35d3d48dc236ee3b17293549073ea11c682bfc20badb4e
font_01_sfnt_off00010d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A9 11260 bytes
SHA-256: d95c4182dd2f91514c0c446705dfd40ee3e3c9c6ab48dc0dbb1089d9d89bd182

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