Malicious PDF — malware analysis report

Static analysis result for SHA-256 41bd3d6d4c2ed80f…

MALICIOUS

PDF

109.0 KB Created: 2021-08-23 12:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7f98acf4f7c9e03b5b2cad7c77ff3e98 SHA-1: 8c813dea7de9155bfd708172866ce2188db2a5b1 SHA-256: 41bd3d6d4c2ed80fc8b1071756855968ed13ef0a124da1bb4ad0e8b03a0ec6cd
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_BROWSER_INSTALL_LURE' strongly suggests the document is designed to trick users into installing malicious browser extensions or updates. While no scripts were directly extracted, the presence of numerous links to potentially compromised CMS uploads and disposable hosting points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://goldnumber.info/userfiles/file/69948456656.pdf In PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867d62dc9b2---lajolawowenikas.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9901c8ecc7---95599148762.pdfIn PDF document text
    • http://midel.me/userfiles/file/96343291.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/xevenazitusumogavomowoj.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/g1trjjvilk3jcddk9964i7rt18/vunedap.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/wurekufopo.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/o5oltprphtdpvpshkgl63h6qv5/86573540457.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160796e203c08e---91224273078.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/e56hjo8e484esospqh83r9t7f1/wozadakujevumema.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///togasunatukugo.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/lejujorozepegizoxitoz.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/m7mmb3hmtkh5di87p3gn91vbuu/95924782449.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/74791238422.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a2bdc5f7a---kepoxata.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/genolimelazipudukikafati.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/793239390.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads//files/202108020742415320.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/73258570711.pdfIn PDF document text
    • https://flyags.com/editorResources/file///kuliroxuvigejadibe.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610a1cb5541dc---kewikawaxalevagorenul.pdfIn PDF document text
    • https://tipresentoio.it/images/file/63361838728.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/xijigilevujug.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/4e4f8d3bd27931f9a088263c3f98d98a/burodowiwij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=audio+software+for+chromebookPDF 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_off0001477d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1477D 10988 bytes
SHA-256: 9515d1457f57f0040e64f495cbd48e88024b68311c7e1c318d701a295c629d0c
font_01_sfnt_off00016120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16120 17368 bytes
SHA-256: c97042d379a3341a54ed0da9952f5f4a75db70fd3ac9614a20d42b290ed73e6e
font_02_sfnt_off00018e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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