Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a3d9d8572be7022…

MALICIOUS

PDF

80.8 KB Created: 2021-09-08 08:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ecf584ad539963ff3eabe019852e1485 SHA-1: 2bf38fff29d569973e808b8b48094d8461339d2b SHA-256: 6a3d9d8572be7022b2c161393400040c9fcb5654f6c0e531192ac9a4f86ea4c2
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://faktxeber.com/resimler/files/95402172788.pdf In PDF document text
    • http://aklond.com/UploadFilesfile///2021052817344191.pdfIn PDF document text
    • http://vhz.cz/user-files/dejuguvafamimufedivarur.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/34610662538.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/gumimuguguwij.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/tawivewumurewis.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/5acde1350afdc5866bdf46e380454022/senidezimen.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161295e8b4b64a---pimugivagipijiz.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/zukedoloxigifepezuw.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/suvunonisewumi.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/togojokowu.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/nibaruwugopaxaposu.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/52467777e7c8fd34dda9adbcd425545d/50006824703.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160f24f6d16d64---79386131946.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/35828004741.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/95a2b1f8edf07a4cbde251919fc2d8cf/35217670364.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/04869d4e4f52b096e917cc989d08a52d/doduvetiwaxibama.pdfIn PDF document text
    • http://strefa-fitness.pl//fckeditor/editor/filemanager/connectors/phpplikifile/78901321451.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/76327375558.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e085ec585b---xuxiponopowatenibosak.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/nilokoposanidaveve.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/d2450b229dcb25e0c7fd41cc133d2eb0/rejubikosenamixak.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/210f14c90e2e765b3602d216278bd09a/pebazigu.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/sejeda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=distribution+channel+assessment+worksheet+examplesPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/44902107824.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_off0000d547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD547 11160 bytes
SHA-256: 45516ee6cf1996395bfd2cf2cf54d42e34113751b1a78011937f717e7f407063
font_01_sfnt_off0000ef0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0C 17756 bytes
SHA-256: 626545ec5f3c8b68341a41ef27a616e1959daf42b1ae23ca41dda3f072272a59
font_02_sfnt_off00011d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1