Malicious PDF — malware analysis report

Static analysis result for SHA-256 39d953156d225ed2…

MALICIOUS

PDF

79.4 KB Created: 2021-09-07 19:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 2b9ae16b34dce2090bb639aa1058b2d9 SHA-1: 4da260ebb794f0d6cc3ac9e6db3e5b9ee7d76ec5 SHA-256: 39d953156d225ed2ce7ea44302ed0751b3f4b5f1e9e73aa36fbaf2fc3d679f16
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of these links and the overall structure point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://ipmarketing.net/userfiles/file/15889968066.pdf In PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/67142742970.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/1f4sl3q10u8h8hu4inl25r05gq/10168848643.pdfIn PDF document text
    • http://robinsonfamilyreunion2021.com/clients/7/77/7769cd5c98d63cfb9738ae2db1c5c42c/File/95242034533.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/32944911971.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/320eddb2db6b4ce1eb689e9a1d40cc69/82526820363.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/17927414ebbdd632f9b8b67f07b17610/dibuvivowubudunedibanijit.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071de312e670---91416549613.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/55991637281.pdfIn PDF document text
    • http://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/susuruzosa.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xuwabive.pdfIn PDF document text
    • http://jaatkinson.com/userimages/56420536124.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/8f439d85fbb10d05d30d4231cecec0d6/gemarafokitowojuxag.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/teposigesenenabubosebisa.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b646254a2a9---19724778383.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/e06522a4637f5e69c09458b3cd912441/zaxubafige.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c912545c7c---14360778094.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/0b507babf29e013992a42855e82c88fd/fevajutexutuvuxikinetoto.pdfIn PDF document text
    • http://e-sportis.com/images/upload/berilibajo.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16081c2ab3220b---febavabobujuzarixelogag.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/zilibinezakupiga.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/nikipumosedeva.pdfIn PDF document text
    • http://digifast.cz/userfiles/muxenobavud.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/70077837292.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/mixeriwamoso.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be5ffa765c2---lesitopegi.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/1cc613d5551387bf1e3df6a51023ab52/74403497502.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=convert+word+2016+to+pdf+with+bookmarksPDF 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_off0000d0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C0 16852 bytes
SHA-256: 3937cb5116671241c7dad107eb4eb902a8b6c5eb267dc1c5f57374edfde91360
font_01_sfnt_off0000fc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11478 11596 bytes
SHA-256: 433db19adc2b4e2c991caf62981e186178a77310d912b15046cf4fa6990056a6

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