Malicious PDF — malware analysis report

Static analysis result for SHA-256 4900b45860ff4534…

MALICIOUS

PDF

68.6 KB Created: 2021-09-16 11:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 966db95e44d37ff4f57431e573971f1a SHA-1: 1333aced09a3b3bf8a22df70373a88698d690081 SHA-256: 4900b45860ff4534c8fd8200080389b9162cf7150e972a6602ab1f8c130d540e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://mauspro.net/upload/files/23403723524.pdf In PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/23956626034.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132612225e57---motigedozivajogibo.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/75173175650.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/55398939226.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/mipobevabijifosu.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/34420239738.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/disizefizebuxejibazewase.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/xavezesuxolopivi.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/xosumarozebes.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/76919768224.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/vapipanipetegapeve.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/rulol.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/rudowi.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/8642901949.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/36817565660.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161381885c9359---18896835624.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/46311198516.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/puvolodinusigu.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132b90b44802---lefesegigoxodokemakedenev.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/26775400743.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/c90fe91aba771143fab1808da5b629c1/54463411849.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=totok+apk+app+downloadPDF 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_off0000afdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFDF 10036 bytes
SHA-256: e921ab7a3ac39c9a42efb4f655cfbce32fd97d6d7b1296b299772cf740f8e717
font_01_sfnt_off0000c65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC65E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE70 15404 bytes
SHA-256: 0f49c68a948f473a0f998750a9b930ac0df578e666dff00eeb3b13f5dd1efdba