Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fae7f956f145255…

MALICIOUS

PDF

87.6 KB Created: 2021-10-14 18:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 13088f5ca08dc3b4eab441de84d5f086 SHA-1: cf080244fa1782b04c44ad4a0892ee4d2565e077 SHA-256: 0fae7f956f14525576eee12e7634b810c359ee0fa8272983afe047bab6344cb3
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to external sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the assessment of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://skene.es/userfiles/file/sejaxopipude.pdf In PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/xibiret.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/barevaxuxo.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/61066075793.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/vukaxamowok.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161581ca5448df---20520177769.pdfIn PDF document text
    • http://dsagco.com/Upload/file/43460974954.pdfIn PDF document text
    • http://mislenyiallatorvos.hu/userfiles/file/tawivibubexo.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/ledoponujod.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a04c4757bf---28501689270.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/69931220480.pdfIn PDF document text
    • http://eko-uklid.com/files/file/porinitip.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/xudefex.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613854dee708c---45696111564.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/xedox.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/37067763030.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/13985070653.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/81273411974.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/todudixixereletezowavebap.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a22fd4e070---wokebezonabe.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/3736777489.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/remowomemaduwuzonigepuko.pdfIn PDF document text
    • http://headrepublic.pl/images/files/tefimirazajefewixa.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/65624539189.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/4dZi1sgP-vI/uplcv?utm_term=clearing+it+upPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A6 10268 bytes
SHA-256: 683615ca4e71d980e1c920932d107dbc4f96b167457d18b73743f0eeb13f06cc
font_01_sfnt_off0000fcd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E2 2044 bytes
SHA-256: 97a693020a9c67c913fa5abf5d83a61848c846aa130c5182d8e66f233602b60d
font_03_sfnt_off00011e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2C 19200 bytes
SHA-256: ce132941624bf236c445ddd6c662ba12a67a65a039460a4710a0c44b6582eca1

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