Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb45e38d41d9a8e7…

MALICIOUS

PDF

76.0 KB Created: 2021-10-03 08:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9caee4d33123893e7dc2c5cc6d4bc2a3 SHA-1: b740452966b3077349f50b90aa5b1492cb918bcb SHA-256: cb45e38d41d9a8e7e738d04744d3f5ef3efee7a5983c134b163585163c453f72
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that point to compromised websites and disposable hosting. The primary purpose appears to be redirecting users to malicious content, likely for credential harvesting or further malware deployment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://huntic.ru/uplcv?utm_term=then+after+synonyms PDF link annotation
    • http://szpk.hu/_user/file/85747823648.pdfIn PDF document text
    • http://terfigyelokamera.info/files/file/98043748698.pdfIn PDF document text
    • http://atrsara.ir/resource/files/35089543542.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/b38apeur5n7ml8ckdjm89c92ko/safasogalorejiluvesep.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/74021711622.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/jijutebuz.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/fotow.pdfIn PDF document text
    • https://foulardfotografando.it/file/74425829835.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/51455633717.pdfIn PDF document text
    • http://mamitobe.ru/files/file/20868339515.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/zokewebeberivo.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16138a45d01f63---rawolo.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613597a4853ec---tebizezunifete.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/suvejepawase.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/85104314006.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/kanatu.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/29f84a6e547c7d9108d8da3860ed11c4/vamifeb.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/57349441404.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/guzaxofiwopo.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/balotununijesedufida.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1613e786d3db9f---bezoruvuvigediguv.pdfIn PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/rutorabu.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/199112c6ca03170a004e61b16ae3235c/netinudelubiji.pdfIn PDF document text
    • 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_off0000befe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD715 10420 bytes
SHA-256: 7d2f52031df2f088bf59dcf02683abc9fbc79e3ac84b8ad8cc95f87d950259f5
font_02_sfnt_off0000ee8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8E 20124 bytes
SHA-256: ab24099297321643462f4054e54444882018c2da591a9f6bf1b405557c87ad42

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