Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c50c85d2b4aac5…

MALICIOUS

PDF

96.7 KB Created: 2021-07-02 20:37:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e6c4c9440c79b29ce2d7f898b4530f2f SHA-1: 03562a8dde616b9969375a02ec7676c911e1d71d SHA-256: 98c50c85d2b4aac52cc05edc4d22612a6895c925ab104b04f23ddcfb39e7da81
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to compromised WordPress sites and disposable hosting, suggesting a phishing or malicious redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://queure.ru/uplcv?utm_term=solving+exponential+equations+worksheet+doc PDF link annotation
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/vk8l7h52b7oubfnduoeqeheqj1/86307839982.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/selunozowilozubozube.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608227caebb46---pifuzosusawani.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/78926699730.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/aef5e1c0933e301c52bae6fea4b66796/75538718302.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/pozoj.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/laligutufikirokokedixezuk.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609adbed0a118---47877333014.pdfIn PDF document text
    • https://maintogelonline.info/contents//files/69590109532.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/dofodezu.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/16550591923.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/66c6cb80939e6e8afb81aea5caba799f/37905835928.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c995fc95fa6---vixatod.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/2d3126e91c59237566c4205791bf1bd0/mogezuzulaxiwoton.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9df7e5ed6---13023262524.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/29fe03ff675eff3772234c2227c89a5c/52887790393.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/hhdq2hus2rt13k6qcfb7ukpg83/90505687761.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/sawodusafedoxolovuzor.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/fc192942dadbd52e19b3d15c4367fc41/66171413817.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/nadoveb.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/4d8157bad7dfe9cc3e7e8008b42f84b3/97418246033.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607208192514f---51563070485.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2d8a9b496---gopiroxiwimetobaloluri.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1321c020e0---36699989120.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/233364d90c0d2e6aa3004f51aedd904f/28787502117.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_off00011167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11167 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001297e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297E 11460 bytes
SHA-256: 3485af963d1e9cb98ae83468d2fd6ae4cb4c011cf33552f7ce6d2d8a7d40eb01
font_02_sfnt_off00014414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14414 17952 bytes
SHA-256: 481a86b5f3962f594e7b5132650da3184d10258bd93126841b6d3b5860e37237

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