Malicious PDF — malware analysis report

Static analysis result for SHA-256 000d7d9d8b09ac9b…

MALICIOUS

PDF

77.6 KB Created: 2021-09-05 14:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f8429c03824d1b94d6488158cbec7ba3 SHA-1: dff57fae6601f51f78c6ab70d4e00526db302f63 SHA-256: 000d7d9d8b09ac9b4b26186ad4a51724bd45e27f33fbbe9d077ff9084f2f3142
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on compromised WordPress sites and disposable hosting, likely for SEO manipulation or to distribute further malware. The presence of multiple external URIs and the compromised CMS upload link farm heuristic strongly suggest this document is part of a phishing or malicious redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6760

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://aarogyamedico.com/userfiles/file/80829571637.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca43270ffc---fegos.pdf
    • http://atrsara.ir/resource/files/kigobemumijoji.pdf
    • http://gostinica-domodedovo.ru/files/sulukan.pdf
    • http://joesservicecenternj.com/userfiles/files/dobelo.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/37659c22cfe46caf4618dcd71b2df1fa/lotiminul.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765831978a0---zurexuvozuzaxalagedewali.pdf
    • http://ahkjt.com/upfile/file/gimizaxajamunipesezuz.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb73450d43---72676299122.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070b2a68879c---90238609669.pdf
    • http://altelaw.com/uploads/image/file/wonaruxefopipufade.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/e14826117c4e089141663c645b42dd94/12274767379.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077416e0d61f---zurokumokolezegipokume.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/00a6472a2dfc0273f95bbc6fcb2b9a7c/43195406010.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/9e1dad4e94e7f8bfaeabe752579a8213/sulabugedixakubifabexow.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/svfdag92c7aql1slc282so2av1/vutosepabija.pdf
    • https://samirkumarpaul.com/ckfinder/userfiles/files/67604624408.pdf
    • http://medicaldistri.com/ckfinder_files/files/kukuvetujinovexefilulev.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d503d68715a---62012924970.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16080998dabb6f---23389044451.pdf
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/69103159674.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/0mb92cks172q6vjnhqomg3fq9p/ludumagumatebudomom.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=worksheet+on+patinig
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8be.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BE 16792 bytes
font_01_sfnt_off0000f0d5.bin
b99f51873330c3d08dffd5bcbdffabfa205caa665065e5f14597993fc626c455
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D5 10568 bytes
font_02_sfnt_off000108f2.bin
d2f32f0b52ecbb927ce017c7a809729f13d67099c1ccdc003b79a9cf963403e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x108F2 16892 bytes