Malicious PDF — malware analysis report

Static analysis result for SHA-256 04ae5eec8933f7bc…

MALICIOUS

PDF

99.3 KB Created: 2021-07-24 11:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d337f6412a782fd2a93e394da24d7265 SHA-1: 3a4daf44218fee1fb92cdc5f4e7a303020d8ecb1 SHA-256: 04ae5eec8933f7bc78ca29dd8fbfc21dbd6b98c2d1598aed7a9ce858fb258b03
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristics indicate the presence of a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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.
  • 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.
  • 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.contectrade.hu/fckfiles/file/48648876879.pdf In PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba53ecb868f---12094150591.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/c4a793db603f9a64137f9ef4ca80d988/fivusuzenelakalipetoze.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/98178985029.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210530214451.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/bd5474d4d8d6131410ef9098276f305b/noxobiluwebaxipeguf.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/0278e16082b2db2156dc131741450c8b/logelafofer.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/xebeke.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc4073c2b8---safubebugowijitozikujored.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/40207dcf03f0a7afe03658526641b5f1/80716177946.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/27236460436.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/fb538fe634e3ed704e7fbc388675c912/xazezezodepifijebu.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/xutodusake.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/eab0e516b329a72973a5cf4183084097/59930668887.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d586458816---tebodazi.pdfIn PDF document text
    • http://goref.ru/files/file/69730789056.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160890047647b8---88684224726.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/1c92889bbe6e16979f24ebe23c02a42a/vaxisifemomirofavu.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/90956175000.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/xelutofamozigakofabizak.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9f9cef0b2---43597597350.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bbd126e76---61129184389.pdfIn PDF document text
    • https://purefeeling8.com/data/file/ririvowir.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/b09d778cc6533e2e87d80a3f79d1b876/25759761256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=3d+pool+ball+hack+moneyPDF 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_off0001210a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001391c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1391C 17740 bytes
SHA-256: 59fbffb95ad24dbb37c3fa2b8d9de55be1831d5a325b98a37395203e87822839
font_02_sfnt_off00016763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16763 10744 bytes
SHA-256: aeece52b1178f1905fbdf688ca506e7e2443237b27d15e341ed9f086de07683f