Malicious PDF — malware analysis report

Static analysis result for SHA-256 c30fdd53abed02cb…

MALICIOUS

PDF

82.2 KB Created: 2021-09-02 08:34:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 653742835f2d38ed09948df0886cf7c9 SHA-1: b0e9028964f736116a37897de66a7f385b46a751 SHA-256: c30fdd53abed02cb483bc6f3741befcaca7696915317db22002f8732d9ba0587
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of numerous external URIs, many hosted on potentially compromised or disposable domains, indicates a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. The document likely serves as a lure to download further malicious payloads or conduct phishing.

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 https://inwebjor.ru/uplcv?utm_term=power+system+relaying+4th+edition+solution+manual+pdf PDF link annotation
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/cef9434bf35742b83210c49ef8c15447/82183382620.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/tikofivususebavirelekadin.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/34874088109.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/fedufumawokuf.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/84402994661.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7065495a88---69814668832.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/rosasujiwudizi.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/28adcad7b96e17e7b4b23ecfc5cc7242/xamelozibelef.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/63255197647.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/80422860214.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/39620687676.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8a9a0c8c90---3789237525.pdfIn PDF document text
    • http://clingac.es/d/files/19688395447.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/tujafo.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/14768110066.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/91636098125.pdfIn PDF document text
    • http://marketingnews.fr/images/file/20725029646.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7be406afa---56571750625.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b437a85bda9---duzobovikusuxuwepuwuxef.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/66359519192.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e211197f27---reguba.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/41128654711.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/5066824049.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/75502208319.pdfIn PDF document text
    • https://unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/menemetenazojevuduzu.pdfIn PDF document text
    • 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_off0000dae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE2 17552 bytes
SHA-256: decc327768d69b39bb2c814875a4934af600628fbbde0d0e21786c7d313ea8d8
font_01_sfnt_off000108bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BB 11324 bytes
SHA-256: 878f7d22b8ea24ca65844f561f7c9aca537a6539bb9349b472a96c2631a03103
font_02_sfnt_off0001231d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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