Malicious PDF — malware analysis report

Static analysis result for SHA-256 35cf0f47b93acfe2…

MALICIOUS

PDF

85.2 KB Created: 2021-09-23 11:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: daf18014c8de95b8fa76d49264fd7b5a SHA-1: 7fe43bb4fc8f032639a049554bac8962718aa629 SHA-256: 35cf0f47b93acfe29ce71cd70d2dbc8c1a77034559c9e5816473c64ce30835b8
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://vntattoosupply.net/uploads/image/files/72850165631.pdf In PDF document text
    • http://baigeleather.com/userfiles/file/41747812259.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/5161244954.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/valojulapawezukep.pdfIn PDF document text
    • https://auto826.com/uploads/files/68490173785.pdfIn PDF document text
    • https://yensaovinastar.com/media/files/kenotisegerakutifoxixadu.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/tituxujimuxawaxofi.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bdfba2a4fd---gogobaku.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/gigitom.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/44214578143.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/36769988057.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/muwozumorij.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/2687333270.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/8100641179.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/tejirimu.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142ef3b07b68---98168069766.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/22729978246.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/gesebilajexaw.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/wopodasamoxepofar.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142710400dd4---32649527004.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/tolonasoluxi.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/gajazifipefuwaxiranupuxi.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/refixefejirutepox.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/21335261605.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=free+fire+apk+download+diamond+hackPDF 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_off0000e58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA0 18672 bytes
SHA-256: df180ea260993d96b1d8ea26fe8383ff2c8e8f9fc726d75a02b6eb051e21aec3
font_02_sfnt_off00012ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBF 10776 bytes
SHA-256: 6d6e3be94559b843a56dd91972f433012234d670b70bef9fae5b5f3790fc2ebc

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