Malicious PDF — malware analysis report

Static analysis result for SHA-256 e139b0732bdd95c7…

MALICIOUS

PDF

89.3 KB Created: 2021-09-05 01:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 42a45744213bc7832d8ccfa6a8d958e3 SHA-1: c18c24a56111699aba71807042c4a565c64c9ac4 SHA-256: e139b0732bdd95c745246472d731eee47998ff477c734d741e5226ce6fb01ac2
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript, indicating it likely attempts to exploit vulnerabilities or perform malicious actions within the PDF viewer. The numerous external links, many pointing to compromised or disposable hosting, suggest a link farm designed to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://acrgroup.nl/userfiles/file/doxutonoxobevajube.pdf In PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/24514515545.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d81cf30d87---gunenatifodejonupivopu.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/mimagekikexovuwa.pdfIn PDF document text
    • http://inlygiaylynhua.com/upload/files/fawatobakax.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/12860002302.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/ae9fa0d860a8e771beef671c0c09b74e/riwawoxalumobaseluzufuka.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/dosajivi.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a952aec157e---96055850783.pdfIn PDF document text
    • http://apelasyon.com/img/userfiles/files/nepimokinaxugepofo.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1610474c698823---zebidosevote.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db2044e4843---17124059255.pdfIn PDF document text
    • https://kede.org/userfiles/file/89241922495.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/2833105992.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/8e0137348ce82de2e204b22f55019b43/rekeninamirejidulipufid.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f417ca56744---bivetaj.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/98105190529.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/19168182655.pdfIn PDF document text
    • https://shiokerbau1.com/contents/files/39644746826.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fd35c3a37d---mirufepufajato.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/15149964786.pdfIn PDF document text
    • http://elitvorota.ru/f/file/rogatagi.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/74498969145.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/geworizalorigax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=ph%E1%BA%A7n+m%E1%BB%81m+chuy%E1%BB%83n+%C4%91%E1%BB%95i+pdf+sang+word+solidPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC736 23244 bytes
SHA-256: 629e8208151fc93b9023156d521c0040822c1dc766e1ce738264d3da77795652
font_01_sfnt_off0001026b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026B 12140 bytes
SHA-256: 84a14542e3f4a98209192d7bdfeff9b3cd609d2dbf9b529a5292500a382c9017
font_02_sfnt_off00011dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC9 16128 bytes
SHA-256: e086d997b6ee3c3fe48f8fdf49e8854b9e9bef9c53b5c2c5f26bba4f2b277426
font_03_sfnt_off0001331e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1331E 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_04_sfnt_off00013ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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