Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc8890c5bedb36a…

MALICIOUS

PDF

87.3 KB Created: 2021-05-24 02:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f328254bb103ad990f9e5e4f0713c4bb SHA-1: 452950fbf896d92c03613c90ffab2dde73a311af SHA-256: 9bc8890c5bedb36aab3cf5ce2579a8f787d62d7e284753905bdd2bb352c42dcc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially malicious websites. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7998

Heuristics 5

  • 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
  • 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://smidgel.ru/uplcv?utm_term=two+gentlemen+of+verona+summary+1st+puc PDF link annotation
    • http://czdashan.cn/uploadfile/file/2021050202355273499.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed89caaa53---57321452023.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/069e17d4b45f8496211d5364e32ff7be/tejajovak.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/84aea723710f183bc3d06405f11e961b/bolatumefigolinov.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1362e2055---90689050576.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/add72fb6ab8efa72113af4c910b9876f/keritesokojogugi.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/27315385432.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/v82kbje8fvsmih91bj844o2nqv/40010599583.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3efe3335d---94123001192.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/28g5nmh7jmrlndkgg9422ie025/wemigatedagevirodeku.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/karovugifejobegiduzuv.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/223bf793e2104290041aa9afa8ae3c28/jirilirexi.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/88bd27ef51b0bfccbd27cbb2b4df2557/xesusirogoxebabawa.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16096875b17700---32835527516.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa247cf22f---vozanitalififuzuxuxenil.pdfIn PDF document text
    • https://areicon.com/images/file/1147750538.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001176b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176B 3032 bytes
SHA-256: 560b8ab2fc1284a45634aeb8a9b9a82a2b49f915a1eefa4b7e401b790f37a447
font_01_sfnt_off00012241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12241 5588 bytes
SHA-256: 28c4977bbe11fe83ed1eac19ad9ef793955442491e67128c4e0474ff25f04cb5
font_02_sfnt_off00013560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13560 11492 bytes
SHA-256: daa18dc01b0f2c34401a43113a7e99c5d37fd695946e92fdcc551de99446d1db

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