Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc36723bffa72201…

MALICIOUS

PDF

88.7 KB Created: 2021-09-14 10:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 80bd9eb7ceac43d207242b6ffa9d3c19 SHA-1: 7da5752b7b30facedbfe6d24fc3d01934295865d SHA-256: fc36723bffa7220150f139bd63d486c630d85cd53f6e08ad470927e853742b77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress upload directories and disposable hosting. This suggests the document is designed to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613375ff38ccf---79724530704.pdf In PDF document text
    • http://eventechsite.com/files/files/nuxizejugupod.pdfIn PDF document text
    • http://grupophi.es/uploads/files/muvufezomijasinulizu.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132676b73ea2---71328283798.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/17732343404.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/68186289110.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/satukelemulodib.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/50759931031.pdfIn PDF document text
    • http://cobmedia.hu/include/raxosepuvifesorukugate.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/toxudizipapabigunora.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/wonepegalagudozesukowavo.pdfIn PDF document text
    • http://coumert.com/images/file/23343168146.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/tasupuxunux.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/17001883054.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/tajixitinefomiburasagi.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d688ad99a4---nimesosabuwefelogizox.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e43836465f---67049333475.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109010150084665.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/pekikof.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/46041260665.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/34412189139.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137209c95b21---tanolijadetosezixo.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/18929103341.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/wazazafatatevivalefaxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+deactivate+developer+mode+on+androidPDF 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_off0000f419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF419 10648 bytes
SHA-256: 7129e4b3a225c1702509421964d7b637a538b801fdb4dfdc01821e0df552decc
font_01_sfnt_off00010c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C67 18372 bytes
SHA-256: d3cf5ced6527a523c0b3c994d3bb511d8692a293732ad5efac448686aef89a83
font_02_sfnt_off00013cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1