Malicious PDF — malware analysis report

Static analysis result for SHA-256 db8bc278a573f8d2…

MALICIOUS

PDF

87.3 KB Created: 2021-08-14 13:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1f6ddc0dcf11a6c94ff47755e0df3334 SHA-1: bc72a79a89420544265684df5015257538a77004 SHA-256: db8bc278a573f8d2734d8f58212eb60bde6a4e745087085ac6c3d541b5a9abdf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, with a high probability of being a phishing or malware distribution lure. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farms indicates a strategy to obscure the ultimate destination and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://huntic.ru/uplcv?utm_term=polk+county+iowa+arrest+records PDF link annotation
    • http://peneleos.pl/userfiles/file/vusemiba.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/58f2b8191233a4701410564ec443162d/53545704807.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f036341d032---71216070186.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f0e282124---89420706910.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/naninalew.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160af89e0c66f3---53382787150.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/raroxedifesawoxa.pdfIn PDF document text
    • http://www.ipkameralari24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da91b483618---ziworowamipuvuxipiwaj.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/67387720589.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/80u25or3qs014sj8rru3fdag71/dobotolete.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/36a4a3966cafc28cd00340e74ead1993/64294507331.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/telipusekadekow.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/petetodi.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee6a02d9d5---84166700716.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/35697543572.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/5b608421d1a4cb9dd8dad51f8cbc3cd7/domovazuwowumavej.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/90717474642.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/mibupekalusipupaba.pdfIn PDF document text
    • https://faprosid.com/file/biduxexijoneg.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc3b73275b---88776635843.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/movebuxepodizojofelurod.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/bikorekipewesokumubiti.pdfIn PDF document text
    • https://airbays.com/userfiles/file/67982289439.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_off0000ee9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9B 10756 bytes
SHA-256: 892965bfc87b2de4dcca9c796eba013331efa0090cc9f52265c39b9629ae5055
font_01_sfnt_off0001079e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB0 18212 bytes
SHA-256: 0b35131726d36da407ca7e48d0aeababf6304a2daae6b11bac679f4f787b50ae

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