Malicious PDF — malware analysis report

Static analysis result for SHA-256 27044d5af24ccb95…

MALICIOUS

PDF

87.4 KB Created: 2021-08-01 09:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 64c87c2ac529dcdf011dfa395da32ae6 SHA-1: d62895c1856475b49452eb4b03642643c88a7da9 SHA-256: 27044d5af24ccb9502763bf6599c44989687c93e65bbd21ffa09790f0c7bb604
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The PDF itself does not contain readable text, but the heuristics indicate a pattern of hosting links on disposable or compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5632

Heuristics 5

  • 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
  • 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://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f5551323---40439127610.pdf In PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-5/20210505050602837475.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b37f767b76---pudezoxofipotuzatimalamib.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20216312902903.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65577873175.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/saxebajimebogaletisizoze.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/bp8cth4bnov49ihoen6l844je0/8291005713.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608059daabd59---regasomudemenojiroz.pdfIn PDF document text
    • http://geobrofab.com/clients/d/da/da7cd3953015cd63472398095fc1fcdd/File/1497982273.pdfIn PDF document text
    • http://armanetti.com/images/girejubisedenikop.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/wumipagiteritukum.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b13549329ca---13773071134.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/lirufusazotojotixir.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/bivafixopalasuvotuvoxo.pdfIn PDF document text
    • http://poorclarescork.ie/images/41925873594.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/62470472612.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/bonafarakupi.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/b7f55e1a9d263f11385b904e39c8e646/36904049831.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/367a54650cb099034b40146d165d1bce/54224041550.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/gorofenogu.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/rewax.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bb2c87839---80911859112.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/27027653695.pdfIn PDF document text
    • http://kaies.cn/upfiles/2107281633112010424ce6eg.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab694d46796---55809717658.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16087d8a54ea72---medetepeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=divinity+2+wiederbeleben+zauberPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13577 10640 bytes
SHA-256: 3c314b441988106d0bf5daa5062d146debb7adaf6818a396b7346744680be6e6