Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bacde94936ed9ce…

MALICIOUS

PDF

98.7 KB Created: 2021-09-08 05:32:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3b2d370ef9e86be0a879abf1367529e5 SHA-1: 783676ea578898d65f4bd919ac2edcb53a83f355 SHA-256: 0bacde94936ed9ced8594d6ee13b127ce5a6b420b7914c237c1a6237d6e595d1
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. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs, while some are marked benign, contribute to the overall pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://energo-winstal.pl/userfiles/file/94599498596.pdf In PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/d816c741af14df13c160cc9aaa4233a1/52967216832.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/78900581706.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a18cd0bc43d---70744920400.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160985b351785d---wibelovalizabu.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/xogidaderuv.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/jemagelibonudununonav.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8833737cbd---35641923700.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/a8bcb0ab36e8b9e61d72cca567d18fb8/94349449186.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/g74aptl97qakqc4gb4c89s8qt0/390287788.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles//imagenes/4789941632.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/xisosimimefudip.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/mitigujewukiwosi.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607555b7d554c---1351093441.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/aacfaaba69ccd926eb9cae39aa5cd2d2/wolovolatelatidomet.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/9cd1dd2b008d37d840b84befc8fe4269/puzizavewomot.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/wavofigimowi.pdfIn PDF document text
    • http://teifsepahan.com/files/file/12109983893.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/befugusevuba.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/27605893736.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/9560028790.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/tt9kkj72jp8o6eq3vlbi8i1o01/mujexuwupomawizufubefa.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/6d721ba9c141c8bbb453e82db2654061/65928304462.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087dfb7127b5---jowibivosevikuvaxal.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/31284240996.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adca018ee6e---wimazopibijotimoseve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=deutsch+lernen+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_off00011bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDA 20172 bytes
SHA-256: 5557ab423cd4a226b0853f87e5770e70918f8ec425659519c26cc8461416e185
font_01_sfnt_off00014ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DDD 10444 bytes
SHA-256: 5ca4b92087a155bafe59d709ba4e33733a683d6d48cf35f65e484f09b7057b0b
font_02_sfnt_off0001658a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1658A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1