Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16fe13bcf4ece7b…

MALICIOUS

PDF

74.0 KB Created: 2021-08-12 22:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fa5ce9e1661089fab6cf0ae2a3b247cc SHA-1: 24cd6281f24cb0a93247bab25f36c818f8d7b6ee SHA-256: c16fe13bcf4ece7b4a757c3e63a16749ca7bce2b14a111bda2296de7688e4ecc
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure itself appears to be a lure, with the document body being unreadable binary data, typical of exploit-laden PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160af8aaae1295---ropeba.pdf In PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/gatawikekufoxeru.pdfIn PDF document text
    • https://armenia4d.com/contents//files/54781548268.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/biguvokivifoniw.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/leroxizufada.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160aa227c4b7b6---42111896789.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d207e064805---parimeduse.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c819a8c0e---zemufisanadolowazozo.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/ba8ad3740c77177e6cdc4349a4202a3e/70536276109.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609971465dd94---gixixekabiruxul.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/ganek.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/66749552666.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160ffe04143fbd---69749701962.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/eqc4l93j4q61fnrt33p0fmrlk7/xinerom.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/75790281317.pdfIn PDF document text
    • http://www.trotasierra.com/plugins/ckfinder/userfiles/files/zobovovozones.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608590dd1c4ec---jajiwasekaxukanenatuk.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/403abb46225bb8ec39b532bbc32356e1/96042181294.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb459785a8d---rigewuxijinajizumebusu.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1be78fc6d---damopenumanulivanowisid.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/c3e66a04594a002625c2bf5be8e6ee0c/82762340050.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/40202394854.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30a902ffec---44351586110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=what+is+the+pressure+canning+methodPDF 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_off0000be44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65B 11008 bytes
SHA-256: ac7074310d42a748f3e1401fd9b68182f665cec321f9067121ebf280f8b4fc90
font_02_sfnt_off0000ef99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF99 16960 bytes
SHA-256: 6115498bfb82474acc98bb0b4457b2eadf9a00fdb5a5bb48c49fca4a8e790c09

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