Malicious PDF — malware analysis report

Static analysis result for SHA-256 6532d37fcb3ead68…

MALICIOUS

PDF

84.0 KB Created: 2021-09-01 13:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5c9be179731ad3e148b835769cae893b SHA-1: 8aa52ef7acb25860ea4cc96268a13007a017ba26 SHA-256: 6532d37fcb3ead68cbbf61e12250c366cfa2250013da23fad39450e0e4b04980
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely contains malicious content. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting. This suggests the document's primary purpose is to redirect users to external sites, which could host phishing pages or facilitate further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://jrpst.pl/userfiles/file/pazemagovurugaturoda.pdf In PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/wizowesudesijom.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/7637570575.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021081320274794.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/03da39a52a01c4a2e5367173a6255822/litapulexisaxapizeserizij.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/majezi.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/68895728921.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/207b03c65b0a7729aeb543b8b9b85678/givupem.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/6462234178.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/c10d0844a2b8e9cc83fb2e88ba9ba1d5/61356687446.pdfIn PDF document text
    • https://digireg.cn/upload/sixolozu.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/fulijemamikisezifale.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/6cc7843fc2fce7ccad0bfce7e6d85bbf/95146958697.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a292b39c9cf---53837459752.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/603bbbbae8696659f414f53c70e0f5f8/wuwegafav.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/m888b485bjv7svi8grothvppei/xusajezoluranam.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/90966191454.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/4e4a67f2fb3c1aaa9706787975a3ec4d/51735517983.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfe7266a88---zegixivuguvumiluzijelem.pdfIn PDF document text
    • http://grabnerestriche.at/voxafinobovij.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/6821234922.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/91089660080.pdfIn PDF document text
    • http://melinterior.ru/userfiles/files/diwurezul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=political+thinkers+pdfPDF 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_off0000dcac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAC 20156 bytes
SHA-256: cddf902264efbb288882b90ff88b10e10a5bca0d65861c6b62f1b9d4b4543fce
font_01_sfnt_off000110ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C5 10812 bytes
SHA-256: 743277b1fb602058d84800449f5d3d9ff8d295dbc3f01b2bae2c2e1b8e2c58a5

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