Malicious PDF — malware analysis report

Static analysis result for SHA-256 473bb6120075a75e…

MALICIOUS

PDF

81.2 KB Created: 2021-09-04 17:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4f2b1439073713cae2d3e2d13e566681 SHA-1: 7b08eb717f30e1b0fe9b8a8bbaf967418cf04d57 SHA-256: 473bb6120075a75ed200dcf85ce03fed39fc42b6863e08b6b44b333d78c46cfc
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or serves as a phishing lure. The document functions as a link farm, containing numerous URLs pointing to compromised or disposable hosting, which are likely used to redirect users to malicious sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://srmhomes.com/images/bulk_images/files/dorebenozabukazupepupurim.pdf In PDF document text
    • https://ashleymongolia.mn/uploads/files/vodenupuregu.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f27afaa942---47758840701.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/38909285706.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/9e64a372d4e660dda22168f2e920e34b/jedirenobalugonogeni.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/15276597996.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16099519e3494b---sotivugoxibobifilefijaki.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b57731d0e9---55836578883.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/sebakobekelop.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ecb2331d9dd9693b430f4a8b8c50462e/wijima.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d34a671cfb3---70498664959.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072090d1f1c4---45299417428.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/bujogufazuwezixitesozifa.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/rulelo.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/97485967963.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/5356945678.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210618171410.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/30245940702.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/um0vbb887e23t56eftkghetbq7/10669439619.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2edd1330ae---77392607704.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/68021632147.pdfIn PDF document text
    • http://danielbushreunion.com/clients/41596/File/38514997337.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/60upmiq3megips1cu5rovu6pi0/rizapijoxaliruxizaduvofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=synonyms+worksheets+1st+gradePDF 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_off0000da29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23B 16700 bytes
SHA-256: cd86f760c8ebf5c15f16493cbaa18331f87fac4b48e5f649d0951f7f8ab7f30f
font_02_sfnt_off00011daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAA 10976 bytes
SHA-256: a9621b85452c8c62d11834b4447aa7df2afd7f25791dcff13bb8eff3330a55e0

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