Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c461267e515a7f5…

MALICIOUS

PDF

81.6 KB Created: 2021-09-13 18:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 90fa450e68d8a2bd39f7c0a543f32678 SHA-1: f8fabc6a11adb274d9504e0973d367b550268fc4 SHA-256: 5c461267e515a7f545365e2b32a44379e26ef53d08934c1b5b425eace46d26ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs that function as a link farm, directing users to various external websites. These links are likely used to distribute phishing content or further malware payloads, aligning with the characteristics of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://irlanc.ru/uplcv?utm_term=new+snapchat+update+2021+dark+mode PDF link annotation
    • http://www.pattyn360.com/upload/forum/files/batisati.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/ruxavopapijudozewus.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/1909837376.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/30649543455.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/94994327676.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/20219111759308959.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301a4f97ab3---51354982345.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/23566266216.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0ccf52a0e---76006440234.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/pomoxurerajagubifu.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/dagolex.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d726a8b148---80020579768.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/72020053765.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/22157426873.pdfIn PDF document text
    • http://scsytech.com/upload/files/kopowimudumeditotalanogef.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/97630335724.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/74663355700.pdfIn PDF document text
    • https://blokhol.com/upload/files/gilisafatusefubuv.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/gemipusisedan.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/39177957883.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/zixezijumivepaxonepiz.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a662b5105---tisanaguroweditexiput.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/31039457162.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E2 17964 bytes
SHA-256: 8d4148e60724669bf4b8786d864a7c9719c4da835a980a5959330601847984c1
font_01_sfnt_off0001050c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050C 11188 bytes
SHA-256: 3fa009077873002998bd008316bf5fc896280a1b05e2df8867350bdf1494d37d
font_02_sfnt_off00011f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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