Malicious PDF — malware analysis report

Static analysis result for SHA-256 a96856ecc954a01e…

MALICIOUS

PDF

80.8 KB Created: 2021-09-04 11:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 57f2d3067c184708570dd78414636a41 SHA-1: 51cc485ea5173f40a00ed2097e68f0bae9f8e3e4 SHA-256: a96856ecc954a01e903001130b39c57f264ff27a9e9f08432ee41d99eeaa9dda
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories and disposable hosting domains. These links are likely intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://gat-asset.com/CKEdit/upload/files/30848393011.pdf In PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612ae4cd50ea0---99148064196.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/a2d1e1e8e87f2e93f0c74b8c7eb6758c/xogadarajuzawi.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16102acf36b53c---88470557852.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210825160232-gugug.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/55222254378.pdfIn PDF document text
    • http://vanhacollection.com/images/files/73541323747.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/kolefofojatuvapub.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/nafasowisulobukut.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/vigowated.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/22b2c0c72f1cf9f12f70d1dea3dd3182/mininotiraxoxujiveren.pdfIn PDF document text
    • http://altinay-law.com/images/file/zikejisineninajujel.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f18b213a37---55663383799.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609e865564c4d---41284751443.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/27536553505.pdfIn PDF document text
    • https://rumusjitu.com/contents//files/29268136598.pdfIn PDF document text
    • http://erex.hu/upload/file/77272207897.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c921c2eae34---81801233404.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/3aqduqosq07d1jsj15u21vdj35/30796815342.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071654e3e49f---49454239457.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/82069968264.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/95170843066.pdfIn PDF document text
    • https://ridersshop.it/file/loripojemogigorogaseruju.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/xevifukudu.pdfIn PDF document text
    • http://renovator.cz/files/file/xokupodigewasoxeni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=estenosis+de+meato+uretral+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_off0000d594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD594 10740 bytes
SHA-256: a6305f008f6531fc3af4c51ea7e24a48709ae6562282aacb32399bbf0b368bbf
font_01_sfnt_off0000ee38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001064a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064A 18224 bytes
SHA-256: 30f38dafe1df927668eba17dd43bd070d24a5799b25a79d5f1620753a0287e55