Malicious PDF — malware analysis report

Static analysis result for SHA-256 721e99093d2e79e9…

MALICIOUS

PDF

73.6 KB Created: 2021-09-17 16:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 989edb03339bf404a04df0fcd629ef4c SHA-1: bd24b715d7cacdedf1f35a8e218eccecb48480db SHA-256: 721e99093d2e79e9fce2a9e2e420b57af9f95a16012c8e87065a65bfa79ef500
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to compromised WordPress upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://breedlife.com/upload/files/42926428944.pdf In PDF document text
    • http://www.ecvbrass.ch/user/web/file/sunof.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613933d5079a2---lofed.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/29161821430.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/73014712087.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/siragabububozat.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/xomarolef.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/midepiwurig.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/gafemowar.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/bezojagodologatoruwor.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/90482099221.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e167a4a4c1---12323568297.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/22593730514.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210905112104_ssigti.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/20226071657.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/a97554fb5022717eeff21d500002c327/zezevebewuwikajiwig.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/17986184283.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/13929970127.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/tifupetagetazakikal.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/narabiwubotajugasebef.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff454d0f65---posudaralavo.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/4d5832ebee8be160e2f45724ec2c81a7/wusitiwujajorurofojojosil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=game+card+redemption+pagePDF 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_off0000beda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEDA 16432 bytes
SHA-256: 05878ca86db42c31c943abaf1f27dae0d8fd969040018b703aff7699042ce405
font_01_sfnt_off0000e8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FD 10680 bytes
SHA-256: 62e1474f5335dbd2700337e6185bcd6e8a22b5300c1fc85b76d46bb06a459629
font_02_sfnt_off0001013c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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