Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee61fd79be8e531b…

MALICIOUS

PDF

90.1 KB Created: 2021-08-02 09:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9d82b69d26e74d99e8a8dc1448dff1e7 SHA-1: a708811870cd14079f6d37ab6051a8370dc62422 SHA-256: ee61fd79be8e531b2ee4906081dda1d38a0af2e3b32d892d70f914f1312964d0
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, such as http://nuyewpilot.academy/..., are key indicators of this redirection behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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 https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099fe0b00eb9---63658230810.pdf In PDF document text
    • https://audit-advisers.com/userfiles/file/55544366465.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754738d4f00---2831291444.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161072fa4e7539.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/678ffcc0b3c3931f2c9eb13534aab107/rilewudesiji.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/23616561867.pdfIn PDF document text
    • https://olterus.info/contents//files/zunudu.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/gojukogivizoxazoro.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/87733221296.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/6d1b3e5438a94e78a7c2fceab857a824/97560704665.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/sasoze.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c10a8db11---winido.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/65419663792.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/pojibete.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/lujuwebukesewifikozariw.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16075a8f64b23c---90200547176.pdfIn PDF document text
    • http://vhktn.at/images/content/files/bibojutosov.pdfIn PDF document text
    • http://ehhs1969.com/clients/6/67/67a0fa02f482ea8575b7cec7429e43a8/File/87831349766.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073336f35dfc---vanewupabotigeru.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/jojenovuvojinekojufus.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/jojuzominipawamixuwugeja.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/4e6103056974bd9cc994025122804197/2479425476.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/56663827734.pdfIn PDF document text
    • http://berbun.com/user_img/file/panezed.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc06292ef4---38299155170.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=let%27s+go+pikachu+mystery+gift+codes+2020PDF 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_off0000e73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73F 11456 bytes
SHA-256: 8395d611e00012e7023b5574d914fb4eb4adb8a1fe17cf289363fdac7b0f0367
font_01_sfnt_off0001024b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024B 4024 bytes
SHA-256: 368d4195ae508da1ef5df0f15e3c5c27c89fbdf8699cab278a0c16ef036803af
font_02_sfnt_off00011201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11201 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A13 18172 bytes
SHA-256: 84f5f968a6071087a1e7fbd20292decc50f1f1ed445d8c5dd2d85df31d488f7a

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