Malicious PDF — malware analysis report

Static analysis result for SHA-256 e13cae98a9b26d3f…

MALICIOUS

PDF

81.8 KB Created: 2021-09-06 01:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f5f3d3aeba59edf9cfe525c67253af8c SHA-1: 45dcbd69060f86d713b17f2d96ae4a9106ee0d73 SHA-256: e13cae98a9b26d3f9ac7a95840d42747338ee1d3c5f88b9776c60dd487e6f299
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites, specifically WordPress upload directories, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://dentalcenterstudio.it/userfiles/files/popoj.pdf In PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c201079a8---ganowijux.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/fdefb23cc6d25858927da56d9f132020/kugedenesegakulebitas.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/84018576994.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/9au9k7e7av2po7fjctddkrlhdj/gobuze.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613531351299e---94481837272.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702d5952e04---62917454423.pdfIn PDF document text
    • http://scro.ru/pic/file/70974951548.pdfIn PDF document text
    • http://rafaelokazakov.com/file/basoxigarosewopezumixisos.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/salotilis.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c89a23b711---20292048456.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/649398887.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/kelumoxudipop.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/dogabawul.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad75851e14---17576246833.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89e1e12653---kajejakuruwut.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/68176166097.pdfIn PDF document text
    • http://uctodane.cz/UserFiles/File/pajakaxobu.pdfIn PDF document text
    • http://robbes.nl/media/files/zutijujufabotefirozuta.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/fufarowapupup.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/bigenemuzudemokeviru.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202106230317202164.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/bulasateredapakatifabu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=tecnicas+salpingoclasia+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA34 10560 bytes
SHA-256: 72d2865d0c00e6e4ba3f85b9aea1344363227c756068d8e539c00f8a566440f9
font_01_sfnt_off0000f225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF225 18556 bytes
SHA-256: 4451aba14c0b612fa94956052d00d136b1e9f70908b81a3421508ce2dfb2ac11
font_02_sfnt_off000121a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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