Malicious PDF — malware analysis report

Static analysis result for SHA-256 32c1c11db71d9820…

MALICIOUS

PDF

74.2 KB Created: 2021-09-06 07:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 058f6e97600272d2742fbf6bdc0c1045 SHA-1: 1d38ccb749a992f566fd83741efe1db48c50f1c9 SHA-256: 32c1c11db71d9820315e8ea70da6f46457effa78880a746278b99453a895caa8
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. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other hosting locations. These links likely serve to distribute further malicious content or engage in SEO poisoning. The presence of multiple links on potentially compromised or disposable hosting suggests a phishing or content distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/7c360f462282b535b0d4b65bf8ff475d/guxesof.pdf In PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075f4c223ffb---56893416726.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607003acd8535---kutitipepu.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160ad80c56ee97---11749029158.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210725_FEFA25CC75B69DF9.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/32751974237.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/vedorulenuvoju.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/gemawuzekugudenufetajozex.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/43063653907.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/m68pvvpiokc381tkjqb5uahk56/milepufadexomivulude.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210503143358143.pdfIn PDF document text
    • https://airbays.com/userfiles/file/80963620796.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2025d1417b---46006404360.pdfIn PDF document text
    • http://ipceurope.com/assets/file/kuwosafa.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210715200226_oda74f.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc6587e8b1---tabigafalinuzujuwafobi.pdfIn PDF document text
    • https://guijek.com/userfiles/file/rejasev.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/31665616659.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/vudimusimifufiwepuwugabik.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/43325548980.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/49aeb54e6cb586986a40b9967d3507db/66877407723.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d44a16766b9---zevejujokisuj.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/dgtvpimp87h15s3tn4rkmou2bq/49016704884.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/45109538926.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab4622d695---48136566927.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/79408375701.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075f2a9ce57f---81351389316.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=medical+tourism+in+thailand+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_off0000bebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D6 10976 bytes
SHA-256: c16347ef0e7d27da0e90b3dc86b5b5187518e9937a1e33bc37ed1f78f8d4dc24
font_02_sfnt_off0000f00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00E 16628 bytes
SHA-256: 2dee736b6ce9aa3de4d4f63a6cb5b10e0489e84df1ab0dcdfecd969b7febd212

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