Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca88e361664e3d49…

MALICIOUS

PDF

124.9 KB Created: 2021-07-03 15:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b0f988d3c71f48dd972c9f7a4aaa2fe8 SHA-1: 57e56a1b0059ce4cd05eaad0541eaf147d2a40e3 SHA-256: ca88e361664e3d4942279cba3c86717368b381928893f15723f95c847365d265
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external, potentially malicious, websites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://ketchas.ru/uplcv?utm_term=anno+1800+the+great+eastern PDF link annotation
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16099b7c3d87a6---90283896792.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210515033755.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/56496897736.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/wadapotupemawiju.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/xemaxamobejaxujesofoket.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210621191757.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/fejulutilazepov.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c921fb4ad6f---femufokuf.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899c9f52a0c---depofekemomawitosifufat.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/71435687908.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/fobufojeloporir.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/e0ff86c5d5e40ed04013cd7575e398e7/78730233917.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/kipolodarosunenexeriwenif.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/ab1055735695054e11b6fde5aeee1bf3/zikusadosu.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/47838150278.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077acfa6e769---siwebopukap.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/f913f7e546897e174eb454b969f1f3ef/dilivak.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210529211835080.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d568265bd4---tepibimifojoro.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000152d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152D9 15628 bytes
SHA-256: 2c40f4d84a857f8a308bb052fc67db6e84055cd47e20feab7282c83a6216ed56
font_01_sfnt_off00018220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18220 10612 bytes
SHA-256: 20857f1a67c089d7e70d4d14c896fbf5de6d4fe97868cc4e094d086a3add95ea
font_02_sfnt_off00019a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001b28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B28D 19412 bytes
SHA-256: a121ad9f4dbcb3445493d87d9f1674a9f9e8c63c3df8394902a6443fd8a1709c

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