Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd083838ee99daed…

MALICIOUS

PDF

75.8 KB Created: 2021-09-04 15:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7bf0328828ed1289fa4a31033aed8015 SHA-1: 2c3bde42e228a95f443dbade4d4936815489a886 SHA-256: cd083838ee99daed4e48826f1b2c0fadb8bc3edf07ad4cf3ff9825ed2e7a5cd5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=inventor+2018+3d+pdf+template+download PDF link annotation
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/81286623805.pdfIn PDF document text
    • http://zuche0551.com/upload/file/zofabivoz.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/jusatijexusojipen.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/480a5af017b395ab962b7e1eb0f7553c/71365740611.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/fabb11da1d194df20a52e8b6b3582ce7/raxodobobudo.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0ad3b3783---fofulaxuwawatotejiwodud.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/fac3269eaa9851e567feda2932960d73/45240457321.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/21353356893.pdfIn PDF document text
    • http://ucity69.com/clients/861769/File/64513700886.pdfIn PDF document text
    • http://ahchala.com/img/file/67098291891.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1a634413f---tamin.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/139decb9aafe80949d4f81a7631d568a/32020190418.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160ac62bbd1c1a---wuduziworukuwe.pdfIn PDF document text
    • https://puntoagricoltura.it/file/3823966496.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/07/20/file/widonamilox.pdfIn PDF document text
    • https://hirurgija.me/files/3379240167.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/wapumu.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/88517982281.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/38469f03f16ee614380dbb97e0a5ddef/14742242701.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/soxaneb.pdfIn PDF document text
    • http://songhungthuan.com/upload/files/gemigajemujojigem.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16073cc6dbe389---mojedosudititifu.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/58389962873.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/m5ccuopv8ieda3sjtitl7s7mf2/nulogetenerenaxezunesejin.pdfIn PDF document text
    • http://www.moyekolodin.com/files/42480127331.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_off0000bd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD20 11176 bytes
SHA-256: 4c86b77ecaf9aa87dcea490744a013270568f0f0fc88c4a270a1573555ec7c63
font_01_sfnt_off0000d776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD776 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF88 18264 bytes
SHA-256: b7b9503f4f497c71529755f3b00f1a71b33ab9d2eedf6142e75198d78c4fd983

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