Malicious PDF — malware analysis report

Static analysis result for SHA-256 255ffe14ac95094d…

MALICIOUS

PDF

81.3 KB Created: 2021-09-20 09:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3f4b320968a874991b09c9e84336b75d SHA-1: 3775084af6cac550e3a8a7616ec2505cd5f4d4c8 SHA-256: 255ffe14ac95094d7fdc1e257e6a448915a28f3aa04fc72eb0721ab6904206ff
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload locations and other disposable hosting sites. These links likely serve as lures for phishing or to download further malicious content.

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 http://klimagra.pl/images/wysiwyg_img/file/navudoj.pdf In PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613445261a57c---mawana.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/63272149220.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/somexolepabuxew.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/78686115049.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/muwewavadivajekepukire.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/bjoprj2cvkknrpbds06262v963/77619334029.pdfIn PDF document text
    • http://badgerhillfarm.uk/1465553893.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373f2eb31e8---88840023596.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/bigaponetanizosiresubodo.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/55591747324.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fb3fcc4d7---7257180405.pdfIn PDF document text
    • http://rinsacars.com/files/others/rekatepuxerexeb.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/xujurolitazisavurifok.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/58569778389.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/36681052637.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/86518037998.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/jelalapixokefuvedikaxunes.pdfIn PDF document text
    • http://z500.si/files/sidatale.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/5919144123.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161307dbb38609---54516655601.pdfIn PDF document text
    • http://njchemland.com/upload/files/turug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+sync+outlook+with+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_off0000da10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF227 10720 bytes
SHA-256: 6fe1405a54685de7cd0694c4cc0c6ac92ff93748e0257fcbb9a2fe58980fafa9
font_02_sfnt_off00010ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB8 17440 bytes
SHA-256: e3955ef3af284053bd4f6a7d3d69d97dcef038db5caca29d66aad0ec5ea88aa1