Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8efd369ddc256ce…

MALICIOUS

PDF

109.9 KB Created: 2021-09-17 08:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5d9397a9cc1c24d12a75cef502971f92 SHA-1: dba1bd0b2e259f621afa79e97617fee2350718c9 SHA-256: e8efd369ddc256ce51e3c7ddc6ea9a300b094f29e7dfc7b2396e70c620f9ce5c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the use of disposable hosting for link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://files.ibiza-ferien.de/file/xizifajarumu.pdf In PDF document text
    • http://tincorner.vn/uploads/files/jipapesejitisilusu.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/pikak.pdfIn PDF document text
    • https://sapporopools.com/contents/files/dusisuzaxomonatunagire.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/32849133331.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/36571202350.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/31039284097.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138b88992f18---jemalerelebunatonodivaj.pdfIn PDF document text
    • http://irollee.com/userfiles/file/titupat.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/54655063636.pdfIn PDF document text
    • http://orzo.cz/uploaded/files/17665860270.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/tinijekiwomesofolo.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/63196470172.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/peluzezuxedigof.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/mufedidudizo.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/1ee4150fff3b61e594673a791d66ee64/18582974260.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/54895982824.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/mivodokuwumipiwetakal.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/likobal.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/gemimatolafixi.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/52625542545.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/turabesijuzesogege.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143fa23e9e68---45959412564.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=android+auto+boot+when+charger+connectedPDF 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_off000148dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148DC 10740 bytes
SHA-256: 5095e0e0067aa11c91e115105491084ebcad34c2cccff688061a04ac0144daa7
font_01_sfnt_off00016158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16158 18272 bytes
SHA-256: ca88d3d9dbcafe7c862de6fd2e55d61e5d897cfb98c86c1784792e4b21d88bc4
font_02_sfnt_off0001919d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1919D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1