Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb25d0e8b143e861…

MALICIOUS

PDF

75.7 KB Created: 2021-06-30 03:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7390c1ee6656942dd7219b6386ca6a1f SHA-1: 5748a35a283df460c8caaf9d6c541d3d5b4c4511 SHA-256: bb25d0e8b143e8612c46a7c958a0c3e055e0c6b8770c038173310398d4391a00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous compromised WordPress sites, likely designed to redirect users to malicious or phishing content. No scripts were extracted, but the presence of numerous external links suggests a phishing or content-luring attack vector.

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 https://nomylo.ru/uplcv?utm_term=spice+stores+near+me PDF link annotation
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084dac0ae5b5---bupopudajidovu.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/hufaf3j4u44ror4teq9p7odiaa/lurop.pdfIn PDF document text
    • http://medrea.ru/upload/files/18954789441.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/wubitikad.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607660f12d15e---3982885663.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///risojosawirulozogipise.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/42299961425.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16081644368fe6---72345075681.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/78419147076.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/78883207773.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210620_3DC6759E4C554560.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/sipovutewive.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/41350628569.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210630071454.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/bfd967f395e883a3e7d268b8da10579e/linetedekenujasaparem.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607213137131a---zutilumasad.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16075174ae9968---nomogore.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/serofizuxuxuzepusenofupaj.pdfIn PDF document text
    • http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/buzuramodizot.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_off0000c6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E1 16592 bytes
SHA-256: 5082351ca8ddac45596185b288fcc313e9a3538dfa9dd8cf9c5fbc7538c18ef8
font_01_sfnt_off0000f1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F9 10564 bytes
SHA-256: 043b8e54b3d9ca9091a68afbd1a69e6669802f8d828abe5d6cb59a882b5bd531
font_02_sfnt_off00010a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1