Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4759f71ccb55574…

MALICIOUS

PDF

80.4 KB Created: 2021-09-16 01:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: a5035b93cf44c11bbecdd7eef52989cd SHA-1: 2df30baf3a3d89367ba8a28a108e22d527d87168 SHA-256: e4759f71ccb555745a3cbcda9b58d03d6d762a442ea7e1cd3eefa4321ca9d457
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to redirect users, likely for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=how+to+look+someone+private+instagram PDF link annotation
    • http://a-kamen.com/userfiles/file/62559434206.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/nijusobifaneduwata.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/9bc984670326aaf0e9a6d7ebc4d45d3b/zaxawezaduju.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/sarukukoxugotupedogore.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/a7e63a3e9ddf301f140fa1d9f7dec653/50350993380.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/90806214134.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bemevareri.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/60755722781.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/53925732914.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/sebejojekumiliwutige.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/8a107a4c1a266143f4e5c88c4cc4cbd3/bozonewatinibomugogebe.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/kifedidagijexelata.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/morozexud.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/11839395263.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/mevabubotemes.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/47057279986.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/a8ca1dc9f9b15fe6ab6b65e15ea5441d/34494894975.pdfIn PDF document text
    • http://aven.su/userfiles/file/fupavifewopinanusezejak.pdfIn PDF document text
    • https://atlantidegattico.it/file/jubokuwoxupe.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/52832611004.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/244d213a5de5af1ad3d91d2e748c0482/tuwomo.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/59684485391.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/dexiw.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/zujobufowaxesabage.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/xapolatitokiliwegapi.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/78808936404.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_off0000d6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E6 17152 bytes
SHA-256: 11f9796d341ffcde9a868925e410b314e047ad254d05ca5d3dc7a4ebba51cca9
font_01_sfnt_off000102a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A3 10832 bytes
SHA-256: a278ef2dfc2540e6c9c8523541b526922c6c9a0c8cf1f1a751efed1038586779
font_02_sfnt_off00011b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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