Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f58bf2cfd37bee8…

MALICIOUS

PDF

82.6 KB Created: 2021-10-05 20:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ec5d45c0295933a0ba9522bde2cd713c SHA-1: 7729a9b16d0bf548abd5256a89908eafa1bccaca SHA-256: 5f58bf2cfd37bee81a9ad180885c1baf66193b563e32a4daa79d24586cc42cec
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially harmful content. The presence of these links suggests a phishing or malware distribution attempt.

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://cructi.ru/uplcv?utm_term=the+station+house+motel PDF link annotation
    • https://swapnauraan.com/ckfinder/userfiles/files/joduresetixatawur.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/4387178330.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/89070874661.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76451238602.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/jegabovemudakonit.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/rexiwuvolojikelek.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/mojujuta.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/11452433846.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/41646388370.pdfIn PDF document text
    • https://wasael.com/userfiles/file/gomaregokobefe.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/2dc31cf2b738abbb7f0d3abfbe1bab66/fatifujixuwi.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/92810499260.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/161595bbe1c6f4---mefaluwijosur.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/xexiroxowe.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/21738809189.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/16966735309.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/vufusoduxakimox.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/161596badbe5a7---mosizag.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16146f722b13ce---89423284519.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/75766885312.pdfIn PDF document text
    • http://climtech.com/files/files/37283392848.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///61108618089.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/bijetep.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_off0000dd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD58 10336 bytes
SHA-256: e02324255947375e8bca549537ec182714eea14ef98e21ba5ef4dc2e42ded816
font_01_sfnt_off0000f47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C90 18396 bytes
SHA-256: cb182fe19803397e2cfaf958a026fc50973e6e06cb28474a190e86f8499c8617