Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecdb901e0f16d67e…

MALICIOUS

PDF

98.5 KB Created: 2021-09-07 21:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e974bf235132de58ac999ca6ca267401 SHA-1: eb45aa4e36138c10d698a2db2ffb48c869251bb2 SHA-256: ecdb901e0f16d67e32e2746cbac99c31a3e9e9d5e8972c7054a6d6336fa47e41
164 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external resources, many hosted on compromised WordPress sites or disposable domains, suggesting it functions as a downloader or part of a link farm for phishing. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://slesnick.net/userfiles/files/nofinovagejixigekaw.pdf In PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/42012306370.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/xejikubopokoki.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/5698cc5fd9327a5caf68c63e23c78476/viwasoxusobudanokeminu.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/62efafafe61da13d4d5c05098ec7847e/32496195031.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/zelipowitibabot.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/60821427634.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/roxatari.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/ruguzubaxur.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a28c0086ce8---7821189018.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/poxaga.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/iusktps23r79nsgjcut3pd35qh/voledamevoketere.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87f450ffa2---66989484466.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608b925d443f0---sipojizowoxas.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0abf98beaa---vubenixiworonoleledo.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1642448e1---59261611165.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/xomatomixijo.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b02ea0cb984---kasijaxevolovekapobupomi.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/91620393882.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a31934bafc7---rafafeposunomigutiduk.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/i8889v2vc7d9t7bnkbl8gdoipv/kosezujoxinorapitaneradad.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/59103851353.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=saraswati+physical+education+book+for+class+11+free+download+pdfPDF 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_off00011435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11435 11376 bytes
SHA-256: 564502940721638fd00432d17f7214947b92b9062629f586ee7aac3e169ea13c
font_01_sfnt_off00012ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECD 19320 bytes
SHA-256: 3c33453c4958b449dd82c7ea05fa64d70853f94f1bb07a52e28b2563ddafa031
font_02_sfnt_off000161b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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