Malicious PDF — malware analysis report

Static analysis result for SHA-256 264a572a52e51a29…

MALICIOUS

PDF

71.8 KB Created: 2021-09-09 18:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 18753dbfdc4534736cb24514a0f0cf84 SHA-1: 47f0c00e9335135dc7836cfc6a00304fe09479b2 SHA-256: 264a572a52e51a290132d7283b8b1c5b878181644caa92057f79938024da29f5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://5of7edwardstreet.com/assets/media/files/72697479090.pdf In PDF document text
    • https://renebeumer.nl/userfiles/file/guxunidiwo.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/3674897659.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/putinebisibiwabokide.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/uub46feeoklsd5gkm939qp2nb9/86215003786.pdfIn PDF document text
    • http://purel-biopharm.com/upload/files/54137811242.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/2348295921.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/71642027358.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/1092786207.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/97145164216.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/nebokajizurejer.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/vowepu.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/qsq4k6j5ii2sf49mj2paq3s8k8/72104435608.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/misabizobexifalag.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/61661985386.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/88483457171.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/58261198956.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/mimudusudakunakozexevew.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/zulexo.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/8395093135.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/51161375799.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/vitakenibozuruveranivewub.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/katosafi.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133656fc5778---witomerobeviguwawujero.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=tenth+maths+book+pdfPDF 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_off0000b4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D2 17192 bytes
SHA-256: eaf6fbf81a6a648febd19a87f20ef9ee5aff940fa84bd06a00f252e41876ceeb
font_01_sfnt_off0000e12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12B 10720 bytes
SHA-256: 86b1cfc133be28c5ab218486dc80bb860bb68c91a83dea553ee6cb17925a1ac3
font_02_sfnt_off0000f965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF965 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1