Malicious PDF — malware analysis report

Static analysis result for SHA-256 7386dd221ef122e9…

MALICIOUS

PDF

76.2 KB Created: 2021-09-09 17:18:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 184c212f08fd837c63054ebb8b4714a1 SHA-1: 8ff5675425ca8363232e4e2a3f0c149aaf2ea9b9 SHA-256: 7386dd221ef122e9deeab3a6be74c0137dc48be5545de57cc0e31eef116bdbb1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate structure designed to host many links on various domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://synerhu.ru/uplcv?utm_term=coc+real+hack PDF link annotation
    • https://profitaler.com/UserFiles/file/kotaj.pdfIn PDF document text
    • https://panama4d.com/contents/files/59960292723.pdfIn PDF document text
    • http://air-ned.com/uploads/files/28098642377.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/97691154849.pdfIn PDF document text
    • https://jss-moms.si/upload/File/nudedelipizoduposapar.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/7c4e3ae0e40eaa1090d6cf7352ce2a3f/powel.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/pizetaki.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/93535449917.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/47769343477.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/rinufotosom.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/witagafor.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/73432899726.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/sodikebuxipafuv.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecdb7b6c0e---47928637920.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/tisalojiref.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109030145255041.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/poxudivolisix.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021090410561273499.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/gutaxewid.pdfIn PDF document text
    • https://ms2oke.com/contents/files/94263186095.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318486ec0cc---vufaxuxivanuwugazupapi.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/27182922111.pdfIn PDF document text
    • https://atlantidegattico.it/file/mofotewokogegu.pdfIn PDF document text
    • 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_off0000c82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03C 17284 bytes
SHA-256: 1ac98808a9613ee87b49c7f1c7f17810c7cecc3be8d3a08874ca6dac4cbeff6f
font_02_sfnt_off00010d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D25 9988 bytes
SHA-256: cf23369f646a13a87d31a44126bcb4f51d9c219b9f053f117c0af43dbebf6a06

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