Malicious PDF — malware analysis report

Static analysis result for SHA-256 bda206149a95640a…

MALICIOUS

PDF

87.6 KB Created: 2021-09-01 21:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 37865fe668f74547afbab52d66976d1a SHA-1: 819ab3184fe5fe5684c1da62afd71b81cb10f60c SHA-256: bda206149a95640ab39b4fffd832b99dedb739b75cd3b66a94f55ab34a10cdf0
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to external sites, potentially for phishing or SEO manipulation, rather than executing direct exploits within the PDF itself.

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 http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/90014645306.pdf In PDF document text
    • http://www.dereformasenalicante.com/archivos/files/38931746901.pdfIn PDF document text
    • http://srhs1980.com/clients/877094/File/36572639959.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/wulawutisagib.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/89226091025.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/9295873519.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/7e6587fe009d990d7f992c1315907e49/bufowiwuzokekizira.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/pinenip.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610ef32f889b7---10924209628.pdfIn PDF document text
    • http://jaika.in/images/documents/files/46683664997.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/79628085669.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/29162811567.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/fb0423aa32f6dd52d74c19f8191291fc/25466556837.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/ccecc8774feba60c4129dcf9b007136f/fatewiz.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/11198998856.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe6212329e8---15472189627.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cbcb38418---53188309290.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/6820292455.pdfIn PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/45dad1b15d1413727094f242f07e38e2/kikesavobena.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/fimatafubunax.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/8f5542456b125483cde988b711d9793f/jupesumemiwezabem.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790dc95e7ed---notexiverulexidad.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/savagesibejagu.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/likafovoluzesa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=political+economy+theory+of+mass+media+pptPDF 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_off0000ef81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10798 11000 bytes
SHA-256: 99602fac1b0466716f441af9740c3b8628feb37a899fd4f176d756e821b0934e
font_02_sfnt_off000120f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F7 18452 bytes
SHA-256: 63a74ee5a827c792d686f6c5f9eb0c14cfcb5032997926bebcc9f244da241394

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