Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8be66bb90dc420e…

MALICIOUS

PDF

73.8 KB Created: 2021-09-07 20:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ff3e22ea8ff0227ed1a759eaa0c900c4 SHA-1: ea9154313d38c9d21f38c608205d58d1d6a8f82d SHA-256: f8be66bb90dc420e9fabcf874c3c76b0f5ba0c00caa1954cbda7ee555874698b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while numerous, are primarily used to create a deceptive link farm, with the primary malicious activity likely originating from the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090060cd408a---53901159401.pdf In PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/regelatuzukumuritudiforan.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b304788df8---8400756747.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/ketilinedivamomojerenes.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca1866e3e7---41049992061.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/0d2ab90a173b8be1caa0cfc0e080d645/90339163645.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/b7m3l31km6p7ddq30v5i2dii5g/poduteli.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/27033591224.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/37973243328.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/godafimetezofafap.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/29a3c9064f65e31e6b4bb546e283ed93/kurapilosufutofozemokimom.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ffbd48e1d---90784110595.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/p6b6dlbj4bd1m1et463hgs0kcn/17864277630.pdfIn PDF document text
    • https://combrooncom.com/contents//files/80175427133.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095bdd9600e0---50067457162.pdfIn PDF document text
    • http://jump360.co/upload/files/20210804021418.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/26978503773.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210710032752.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/buderuni.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/37946850478.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079814a18fed---78029720960.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/37445618132.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=pengobatan+efusi+pleura+tb+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_off0000c0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EF 15512 bytes
SHA-256: a6186a22226db4b149232a75fe81cd2d00660a1454044108b5f3d3ebba0756a8
font_02_sfnt_off000100a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A4 10916 bytes
SHA-256: 00775651dada7e14d5ac3198c0ba7c622c13b9df58bbc14fd345f763c8af7b06

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