Malicious PDF — malware analysis report

Static analysis result for SHA-256 d61adc53dfdf7e57…

MALICIOUS

PDF

95.4 KB Created: 2021-07-15 12:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: dae2ae37ca99e0a5cce2482a02d56fc3 SHA-1: 0f0fc3619b8950a297bcd2792d1dcad4d647ab49 SHA-256: d61adc53dfdf7e57f0bcaf128fad2cdbb74c070c1891933c0c25650948ced3e5
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links pointing to compromised or disposable domains, suggesting a link farm used for SEO manipulation or to distribute further malicious content. The document's structure and the nature of the URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a9f1a02e1---92079019872.pdf In PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02b10acace---dopitazex.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/99933158780.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/70444464745.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/22564107303.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b189f9d38ad---65852319820.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811cba2e782---vebopebojevivagaxewa.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/19845931619.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/mosuwupidefulizibilirub.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/doxebeze.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/2c359b83f308865a482ae6b351e3af02/veruzixir.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a099b4169---xaduwafi.pdfIn PDF document text
    • http://dothi.info/images/files/75835881891.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/9cac56d1c01fe5d41a4fc08929b5c196/bazusadavupejozidep.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/r3jqmmfh0um3n9br2kkpsln00r/2143147359.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d2200936d---suxutapemazukivoxadilam.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16071b19d1a94a---68027861765.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/xovexitifemufuxif.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/b4odi81siko9sgvo6ofej4tb95/57370959129.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076d1ed61f74---81268020132.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/hjakfqgmfhq4e9rend9gtd4fb7/radazovaru.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ac1204cda---riwidajuw.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/xafebipamadami.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/lituzawezupizivaluzudu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=electrophilic+substitution+in+furan+occurs+at+position+2+and+5PDF 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_off00010d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7E 11192 bytes
SHA-256: 8030100023b20a27cb6d84e7f7ecc431443dfcc4152409756b31ce96413eb3af
font_01_sfnt_off00012773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12773 18580 bytes
SHA-256: 4c27d908708073be9bbecb6500039de0c9d1d309d97bcd293faa6f7edea6a0fb
font_02_sfnt_off00015790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15790 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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