Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbfa507a46e895fa…

MALICIOUS

PDF

120.4 KB Created: 2021-07-30 12:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 17375b14e7d62713bda162d108969166 SHA-1: 991ca5ad9eb9d9b65ebfa1adc48a2e2c120ae7ff SHA-256: fbfa507a46e895fa91f410a518aa8b812988134f458b8695b821e11ca939d2be
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://murphysbeads.com/clients/54316/File/86273426063.pdf In PDF document text
    • http://immobilieninvestors.de/userfiles/file/55580160584.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/532qoi8kgerahg8lk6thihfejm/modilow.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/rapinimizemafanodesuru.pdfIn PDF document text
    • https://dcimx.com/files/texasakaraveguduv.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/40670116006.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/57424946149.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/63785836172.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/fuwexitomejozoxela.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/tomofevafikofef.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/wazij.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/fanibi.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/08297ec6661a526d1cb6a4b8a8db6ffe/nofabojixomigetafe.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/wimofutuwikununuvizuwi.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/wuzeloxalufomazafuwof.pdfIn PDF document text
    • https://www.natursany.com//ckfinder/userfiles/files/21859333718.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c79bc179f4---fininozezosenuzizujuva.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cc58e71d89d---zefuzal.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/bepidiz.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/2h33hq16ehgiqqe1k3k8t8f4m5/xugeboworimekilif.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090333080eb9---tagokigogakuja.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/vivadubezimajuvupenezuve.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/u4bf15qr3qh6d4afchddgl9i17/parifejogusuvafizoxu.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/b32485e61a6ea2c8c1e5f32d261f75bf/65158313340.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c594a0d251d---63092269669.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=bmw+gina+price+in+indiaPDF 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_off00016fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000187b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187B7 19884 bytes
SHA-256: 9978624c6da06c1456ed6acdb6c96382ed0c15e229fc849383b4dc6e40502d44
font_02_sfnt_off0001bc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC35 10564 bytes
SHA-256: 0956b5ce5625d20328f5e4492caa82fc672c8b1c43de01406f7d53d0dbe20727