Malicious PDF — malware analysis report

Static analysis result for SHA-256 8279e33c6f48bb31…

MALICIOUS

PDF

78.7 KB Created: 2021-08-24 13:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4188cd0e5f1730e46bca8afd00b32a95 SHA-1: 29fd14513289319fff035e85f3c7031156183597 SHA-256: 8279e33c6f48bb31014285dbbb4f12b1d1bf6f6cd0730cec82f4071874ccb074
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The primary purpose appears to be directing users to potentially malicious or compromised external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://clubelsendero.com/img_pag/file/jinamaboxadowotufomunifo.pdf In PDF document text
    • https://stancijanegrin.com/UserFiles/files/12311250388.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/safovabomazi.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca04d66ce1---widufulemuv.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/movegibitokepiwiginakijet.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/90722161398.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/42633776788.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/31299049327.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/kixan.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73b29bb5fa---67771776999.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/2050784998.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/106f4d7cbde898b202ccd35ae9f4d7fb/kuzatesejaz.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c725135587---63423284498.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/e7927deb7c3d2b90f5382ef5b8625771/99035532353.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/35902007833.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077e1bd28ddf---vepufivun.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1611a61f888fba---61756109205.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fb9a01e1e90---puwesanisumef.pdfIn PDF document text
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071544268b1a---tudilefugawu.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210508155454_1375229412.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/72330252884.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/71291263080.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=fps+to+mphPDF 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_off0000d502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD502 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED14 16468 bytes
SHA-256: 69b3bc8b75574f14594eb140bf41397d21cfeb92ada4a366294ee2048b641756
font_02_sfnt_off0001181b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181B 9856 bytes
SHA-256: 93a8ce8bc91c5d620c2505e1871c4c7bb2f562e7d0760d39ee8011815e1d520f

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