Malicious PDF — malware analysis report

Static analysis result for SHA-256 90e17ddcf1e1a649…

MALICIOUS

PDF

70.7 KB Created: 2021-09-25 02:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: b1305b20fd17c262dae6ec8fdffa880c SHA-1: 5fdedeb58d21374e7fea08d5d3c4c577a49ba890 SHA-256: 90e17ddcf1e1a64922f1497fb82899ca9c9c5d6d7e057a0b69bbe80536cf4969
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing campaign designed to trick users into downloading harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae3e061618---sixurevamazej.pdf In PDF document text
    • http://foxgraphics.paulsfashion.in/files/lemozi.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/17025043679.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/9117139665.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/batoniju.pdfIn PDF document text
    • http://aedjtj.pretty-match.com/upload/files/wokarilafexeginagen.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163063182666.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/dedejupotukirugi.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/bovufetedoxus.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/77396551001.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/34400124697.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/rivaroridulil.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134ffd77a7a7---9535701361.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614717770034b---83834993260.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/najolepusupapi.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/82467641087.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-16/20210916035312830875.pdfIn PDF document text
    • http://medica-brno.com/files/gafezowofadefuv.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/63346276384.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/14751161274.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/0d7213f69d017bba2c5cda2a790a885b/bopuwibozuvimevubi.pdfIn PDF document text
    • http://fruitvita.com/files/files/46178562404.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/menuwezeji.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/52473672732.pdfIn PDF document text
    • http://linza-market.ru/upload/files/pobosan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=all+guitar+chords+pdf+downloadPDF 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_off0000b171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB171 16868 bytes
SHA-256: ed8b4d45a78bfe17fb6654912c1c53cdd8a7053da48efb00470b88afc0d5e61c
font_01_sfnt_off0000dbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D8 10932 bytes
SHA-256: 048263ba67f5680b7dd9dce3ff56e90e1c69092a91d10722ba1c216a039b34e2

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