Malicious PDF — malware analysis report

Static analysis result for SHA-256 e49dff6f6f7e2861…

MALICIOUS

PDF

71.4 KB Created: 2021-09-28 10:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f5066e85dc56ab8a712c3bf4e0b5eb16 SHA-1: 97f35d1376370f9021def45716825a0e35574173 SHA-256: e49dff6f6f7e28612cb64bd8b8a98b802ed1f0c67a2421393e36d5dcc7d51742
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous URLs pointing to potentially compromised websites and disposable hosting, suggesting an intent to redirect users to malicious content. The ClamAV detection further confirms its malicious nature, identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=wcc2+cricket+mod+apk
    • http://tvoirostov.ru/ckfinder/userfiles/files/46229703934.pdf
    • https://caribemed.com/userfiles/file/wasomogakubosawelovo.pdf
    • http://geosond.pl/userfiles/file/juremuvalelapibuj.pdf
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/45501505474.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/889fec8f8aed2cc0133205e6b4222962/fuzaxutegegenon.pdf
    • http://abnicum.com/files/file/tafawafonusekirol.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614382e3d503e---lasenupij.pdf
    • http://twilaw.com/files/files/36062121306.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137693c84308---gebodadowupub.pdf
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/83636062619.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b572015e5e---28204554257.pdf
    • http://www.biosafety.biz/ckfinder/userfiles/files/lutetofokawizujesijuw.pdf
    • http://santamariamikado.com/uploads/files/raxilozemitobov.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/b09c5a4b0880b2540e34ff40c86ec521/90437527047.pdf
    • https://penmypoem.com/new/admin/uploadfiles/file/nesipawodarosabe.pdf
    • http://mamolenasnc.it/userfiles/files/xuxolaw.pdf
    • http://dinskayarealty.ru/media/file/70118728768.pdf
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38604396576.pdf
    • http://ristoranteyuri2.com/userfiles/file/33588013632.pdf
    • http://haohanlegend.com/Uploadfiles/files/novabipo.pdf
    • https://dm288.com/slicice/file/62323182463.pdf
    • https://hanyauntuktesting.com/contents/files/fiboxuvubipanikijoma.pdf
    • http://gardena.crazyrockinsushi.com/uploads/files/93137759026.pdf
    • http://de.ruben.pl/ckfinder/userfiles/files/76063982578.pdf
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/56473623578.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b596.bin
0501bc742c623b59a7281caea872320941757faf08ab15515d06d06b168efbd4
pdf-font-stream PDF embedded font (sfnt) at offset 0xB596 16304 bytes
font_01_sfnt_off0000df79.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF79 16792 bytes
font_02_sfnt_off0000f790.bin
2511512a3737d299f8fdaed32e5796e6b1e4f4689701db9db90c4b0920d3f797
pdf-font-stream PDF embedded font (sfnt) at offset 0xF790 10560 bytes