Malicious PDF — malware analysis report

Static analysis result for SHA-256 07507f1d1f53620e…

MALICIOUS

PDF

85.2 KB Created: 2021-09-18 11:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f04c9b7de356d8d34b16d36526d0d00b SHA-1: 7b3a4bfca89b021b4d3d6766bc61a916d2ae63e6 SHA-256: 07507f1d1f53620e965aa17e542dda63038943831cebe226ee6c83a984a1ddfa
156 Risk Score

Malware Insights

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

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. It contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier also strongly flagged this PDF as malicious. The presence of multiple PDF link farm heuristics indicates a deliberate effort to obscure the final destination and potentially distribute malware or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://kapsalonvogue.nl/files/file/lusarevakix.pdf In PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130510ba41b1---60962985529.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/98451941939.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/wanagiravidexogamodefa.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/90989011169.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fowifajigoz.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/wozemaledonoritozojoxuvol.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/59bff61d0ccb9ffe44d903fdc1ce3db2/54568077890.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/3521546891.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/figojizur.pdfIn PDF document text
    • http://soupworld.de/upload/file/39779599994.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/75747829671.pdfIn PDF document text
    • http://shriramashramps.org/userfiles/file/44002575955.pdfIn PDF document text
    • https://www.sudicobank.com/ckfinder/userfiles/files/dudezivawonavotum.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/rilekovogulapaxibi.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/31073610652.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/35490053520.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/87168414690.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc9071fb62---60830979484.pdfIn PDF document text
    • https://mar3ol.com/Files/files/56269167877.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/85455615406.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/57396016930.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=new+code+in+all+star+tower+defensePDF 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_off0000e7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A6 10532 bytes
SHA-256: ca8f3ee5daa41eaeccca6c694768c434f6e03a2762f8a14dbc7209c2ad403366
font_01_sfnt_off0000ffce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCE 18336 bytes
SHA-256: fa2d7dc6681af408af6d0e43e5fcd90e66f094e1081ce452ce9df432b1d4202c
font_02_sfnt_off00012f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1