Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eee8dc40470a919…

MALICIOUS

PDF

84.0 KB Created: 2021-08-01 07:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ef01719f45c5d757b842f71bc0ab6038 SHA-1: 09939a656836220d9c607642edcf13f076dc2245 SHA-256: 9eee8dc40470a919e2ffdd412b92e7c0b7a9a152a16b5a8fca667462f1a852c0
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to obscure the true destination or leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://moscowfashion.net/content/xuploadimages/file/78255378414.pdf In PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/db3gnurhvbnjmp4ve3q5rolenp/45110668757.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/mkdtteneh0gqa0f1u99rf86qu1/54410311472.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/p49fb2igeeteograq7ffbi0q98/80429409759.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/tokon.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/2bde7740e0685969d56c2fa3748bff34/8143130787.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/3e1f74059fd8a8af5187b3a04f91e337/11631698168.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/5797cd9b47d9215c62b9ff8c9dd002dd/moditeretozuju.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/80657860143.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/dc72973e91e7b839dc276dbd6fee0f5b/muganiwijodusewufagokemi.pdfIn PDF document text
    • http://aromacosmetics.bg/assets/userfiles/file/wabafifim.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/lirazevifi.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/16380992529.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/48163318589.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c1c8ba0e0---zufalidata.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bbff0330457---78274748371.pdfIn PDF document text
    • https://www.upperhousedev7.com/ckfinder/userfiles/files/84414431987.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/pikagopekusiruneridesit.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606d63a68d6ef---48239277946.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/qg1uk9c7l32pgjqbq81nc6btgt/denimunolarukowevivogeten.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb23d8a2ca---pupaxutafun.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/44vur2dhj6pj2amkhjdtklclvc/49651796700.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/xidav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=download+happy+new+year+2021+images+hdPDF 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_off0000e277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE277 11236 bytes
SHA-256: a53e6c7c498871d6e9638745c66574d5717ffab4cf64c2d784e9410ab3af2458
font_01_sfnt_off0000fc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7E 16868 bytes
SHA-256: 942823a8444b7649404c417fc70950d09979e034c54a39f209fa0c377a8f9f30
font_02_sfnt_off00012860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12860 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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