Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a6c05cf90def771…

MALICIOUS

PDF

88.9 KB Created: 2021-07-23 03:41:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 104331626cacbb9292d3c69cb00c3510 SHA-1: 8f30b0008b5c887f3f774e2c92b0a484175133e3 SHA-256: 9a6c05cf90def771edf5ac1bf78f3aebe9c9603bdf4e3da53d4fec5d559df949
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to websites hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. No scripts were extracted, and the document body was unreadable, but the link farm structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/7fhprk5tmcdnslp6i0e7vev3n2/fokarof.pdf In PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/totipawilexara.pdfIn PDF document text
    • https://lemanssrl.it/file/modadasoge.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/4868838508.pdfIn PDF document text
    • http://hnatiukreunion.com/clients/b/b5/b5561851e3069b632e798ef7a1275556/File/xomikaxefarolatiduzubijit.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/941543343c051803e155dc03840ac254/88651365529.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/td3mkvu1emko77r2nvub1h3agi/desutodapas.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/nawemabokekovuwinebedumog.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/meveligafa.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc4253f744---pevezaziveguwabe.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830bfeb3995---wazelivixo.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f073e432c36---gojiliwomajajozududi.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/rukemunasuzeferapetaj.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/ziwiverajanimofijexodu.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608605c199998---vamezulamidigofokojefi.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/rurixifenapifumawesu.pdfIn PDF document text
    • http://mfahk.com/upload/files/zenarovoxol.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/nimasafitulezib.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/kukoze.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e39176acaa9---77368010027.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/9c318d236d6637a6d2114720bc8d9d3d/senugiluxipuwis.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/tebemexufosa.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8ac16a648---97873123235.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/92470373910.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/rizanerutifelofojuxum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=poetic+devices+imageryPDF 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_off0000f82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82A 17192 bytes
SHA-256: 92c695ea6d2f3ce3923c3f9911a036bdba7fc5f46ff60234eaf6846c10e0166c
font_01_sfnt_off000124f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F5 10744 bytes
SHA-256: 8200c588d95d3e57e4054ec5a05e64677eedb1572b5f38fa77c076608807b3cd
font_02_sfnt_off00013d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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