Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ffa96911ee29dd4…

MALICIOUS

PDF

87.7 KB Created: 2021-08-14 20:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 85c44e6d1466fdb4b9a898400882a430 SHA-1: 89bbce910cdb6515198fd750786a2946fd7b27e7 SHA-256: 3ffa96911ee29dd49d8d562f9bfc80ae60b4950dfa51cee96045c59f89aa4165
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with compromised CMS uploads or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://rts-wm.com/ckfinder/userfiles/files/lezubulobas.pdf In PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/tmlsulk3b0na595f6546m27l03/texabevomewaxasosizetosom.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/8c0c2a02a84f101aa0365bc56de5c78e/67920342966.pdfIn PDF document text
    • http://ozari-ua.com/files/file/suvegogedodotus.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e6e15eb5f---wuguvinekojipenutikex.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160d64c151ebf3---muxuniwerumajan.pdfIn PDF document text
    • http://bronia.org/userfiles/file/63810446248.pdfIn PDF document text
    • http://baobiachau.com/luutru/files/doxofagalogorokekixesedom.pdfIn PDF document text
    • http://hghs61.com/clients/9/98/9814c5f28b4e93efd1f74733a9fd6b0f/File/galifozajiruxu.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/gowib.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/98137309028.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16087694917dcc---58579808633.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/79874727342.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1b7b4bfe4---47360990272.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/ug7hheuv1ipv0jn849750lfjv0/tirejaxunivizajavu.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/5ad3632193a3026c30e97797f5234870/zomafalepavuxutitiliferu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/41890537176.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/2773951483de5c0de06cbeb453da8c60/zejizefeluma.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b86ba2a52c3---64036036907.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/54052094244.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/53804987394.pdfIn PDF document text
    • http://bluefield1966.com/clients/26642/File/87473647036.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/10311971310.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/21313565574.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=cyberpunk+2077+johnny+silverhand+gun+modsPDF 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_off0000eec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC0 11704 bytes
SHA-256: 29c5aabf05e6598fe9dcdfc7ee6f3368e0059bccbcde5b83ce729b24009fef35
font_01_sfnt_off00010a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A18 17884 bytes
SHA-256: d54029fd586beefe424f71e1a9c6297ed26ae7f74f0c0ef40838e0ff9c716d2e
font_02_sfnt_off000138f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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