Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e7411f33ec8420a…

MALICIOUS

PDF

85.9 KB Created: 2021-09-05 11:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0fbd544b55399323f4cdab8ea0302c1a SHA-1: e9ae37ad4ac4fc0bbd53475bdc3603d86c9ecfc0 SHA-256: 8e7411f33ec8420a3d50cf07b6b4d2da1ada143e71180682701cc0992bccb333
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the document is designed to host or link to malicious content. No scripts were extracted, but the overall structure points to a malicious PDF designed to redirect users to external, potentially compromised, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://okvino.it/file/gabuvonexasaxudazezaliwil.pdf In PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/61055174821.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/sufasa.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/34eee99ae8f2aaea47f5ea0b65839277/rajini.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/zegogogejufuwuvit.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/593a6628292a7b1d2c5b695c2da6ca56/13781854474.pdfIn PDF document text
    • http://lblussana.it/images/file/zoduputunoluvovagab.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/numujepolad.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/88535912460.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/95004ae3a20a4dcf2d446697ed650a97/45920315554.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/madazafunutirofurugabuxo.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16077495236670---wewanuvefogitawilureda.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6fcd653b4---gotof.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160afa00a972df---tikolejexopomezulera.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/dasujibetixofeb.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/75306993400.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/11335515173.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/sitonuzufoli.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f6200da5c2---jipilibip.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/1443398953.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/900bf2d05b78a18f985094a7d9b7e725/52660484114.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc21dbefbf---nuwuvumipupifevetenukela.pdfIn PDF document text
    • http://jaht.com/userfiles/file/50089751816.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/tukadobidijunugimelukel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=debriefing+the+president+the+interrogation+of+saddam+hussein+pdfPDF 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_off0000e723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE723 18772 bytes
SHA-256: 33d941fb2c1f94be517c574428bfcf409b753c64d6d93b2e246329224bdec480
font_01_sfnt_off0001182f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182F 11140 bytes
SHA-256: 87b4f9a4a5b9fb85809bc9ccba51a3027c41544900c632086c0be61f368ba796
font_02_sfnt_off0001319a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1319A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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