Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ad81dcfe52a772b…

MALICIOUS

PDF

89.8 KB Created: 2021-08-15 17:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4b36a47f90f0b18c850d0daf313c2a3f SHA-1: d1ca60bfc9618f76b720ae6331ee819ceb56248e SHA-256: 1ad81dcfe52a772baf60a4471902a9b8dbec093dc66f1fb31bf866a22e14ff37
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a strong likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://venusland.vn/app/webroot/img/files/rutedeferakefexamatakaka.pdf In PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/7685318178.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16079172dab752---satovumejubujuwa.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/32863509248.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/1d917389d32374e3870b9014a02625a4/pazelilorakin.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/13089354639.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/redizetaguxeje.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/waliziz.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/parikumebaramabawel.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/gufilolepu.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3dd316a09f---zoteworegogej.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/82304119276.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/e50a9001b35efe01659f3e1c7a3d8a95/18006702659.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611185ee1806a---70685653013.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/76887206543.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/vopojogobegiru.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/0e5ff37827b72b6565c161043bf7a3c9/31579560098.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c001fa260d---23188430283.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/39142420088.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/256drv7eiit61mfot6d2ag1hm4/96039407864.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/f4ad63a3910c62d83f00fb87111c4bc1/2531827310.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=where+can+i+get+a+passport+photo+taken+near+me+during+covidPDF 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_off0000f8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F5 11168 bytes
SHA-256: 97246e6cdd25fafe1e2a2cc921e8b0620e28b1b91ecd58aea77b3c9c8edc3362
font_02_sfnt_off00012ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB7 17568 bytes
SHA-256: c022e83c7cf915386e78fe85ad4062e9cf288f610ee5becbb924002c5b97d6b3

Open this report in the interactive analyzer, or submit your own file for analysis.