Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbf4dbf83294ff74…

MALICIOUS

PDF

89.4 KB Created: 2021-09-02 16:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a0dbcca15b0ce11c52dc0e2aed135425 SHA-1: 531f1f292315e4d6f2c954f3a4181217c46e7eef SHA-256: fbf4dbf83294ff748c562d20389fbc8097b4b0946adf8cbed23c28b001d3e111
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates an attempt to lead users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ketchas.ru/uplcv?utm_term=broadsoft+voip+manual PDF link annotation
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6a6d30801---rodafuramaluxefofoti.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/64573126254.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/9cid78pc8ruj0jaigmkkj4op94/39524047773.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/20004984744.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/lapimori.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/xokamavogozirufusi.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/1121624486.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/4107625572.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/96064084671.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/11b01301e0b22974a431a9fd54e36af5/54538559027.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/78949280739.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef0f1a382b---pinugobasejagi.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/27108754483.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/89768b74356e3f36244cef6ada285626/nezodelapavupozosu.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/4lv1dhj33u7532lrs4i7fq6vni/93272883268.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/37552567510.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/slvomttq3dmcani6avmsuhtpsk/fegilibide.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608480fc2c94d---vivovenudonirevelo.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/97570321477.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/20709917647.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/goludexebapofeta.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/1608858647.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f5ccea067---98390554270.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_off0000f8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BD 10744 bytes
SHA-256: bea9b5da152620115f55b66ffc149d5fac9fbb8bddd645035479771da07bac8b
font_02_sfnt_off0001296d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296D 18116 bytes
SHA-256: 0a9b791823d7a980c6ec5bc2b9482c66c8ea8373aa5b63887b41c103cc82f278