Malicious PDF — malware analysis report

Static analysis result for SHA-256 c79fc9f88f3be52b…

MALICIOUS

PDF

81.7 KB Created: 2021-10-15 14:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8db2565dcedb5d5404d5cf3f6e944c24 SHA-1: 228be00ea3a329c3c05f2d7fd26a8e371860d11e SHA-256: c79fc9f88f3be52bab2dd3eec570f21277bfbd64f43abe8d0866b22ffc4f923a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common technique for distributing malicious content or phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16143760893fd3---35957418141.pdf In PDF document text
    • http://allier-genealogie.org/File:/vawefid.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/83127740726.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/bajivofef.pdfIn PDF document text
    • http://vps73.juicy-group.com/editor_upload_image/file/wagifedojebipurugivob.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/jofikegisitopezusakafi.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/6645440361.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/43467950444.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137e76fddaff---86526892806.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/repez.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/40006654572.pdfIn PDF document text
    • http://moretonassets.net/userfiles/samozoxisazevevuwibov.pdfIn PDF document text
    • https://mu-rrrc.com/userfiles/file/jutunaresodakuvabe.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/38364916671.pdfIn PDF document text
    • https://12waktu.com/contents/files/xigovelibifa.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/30543262808.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/xibesu.pdfIn PDF document text
    • https://advik.net/userfiles/file/2736851354.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613630756a006---73229746500.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/xisiwumolifizowadakowuf.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/tekitori.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/61430574446.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/fonos.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/HKUGBsJGI0E/uplcv?utm_term=horse+with+no+name+chordsPDF 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_off0000d941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD941 18340 bytes
SHA-256: cb76d49151d2df04d4d48964a39e2fa201714892f39ab68aa759e0505fce74ae
font_01_sfnt_off000108c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C7 10668 bytes
SHA-256: 709c922a5706f3c50bab68e9db6167b2fb70279a2e3345c2febfb94dbc959403
font_02_sfnt_off00012118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12118 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1