Malicious PDF — malware analysis report

Static analysis result for SHA-256 39a85fc2ac26394d…

MALICIOUS

PDF

89.6 KB Created: 2021-06-30 09:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f40adb98cafc94250fc27d9ba6dfdea7 SHA-1: 5ce47f80f7f7c5fea06820a0ca224fa3b0be2354 SHA-256: 39a85fc2ac26394df53d2a10622f7282abf1df1ab0746f7f42b2896571ef2dd0
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://busanpc1.com/upload/fckeditor/file/37374124776.pdf In PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a04e35ea822---71243509909.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/mtofvkkri7b8nb7480qvn3j4u3/77419670395.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/9463333690.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/weruminilomoboxofodupu.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/81707250445.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/71402514c90a553cdf33c0cf331486eb/78062898150.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/rivubavarilixopideluva.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7c760141e---8925585934.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/9b29da503834b8272344348f4bae2076/sawigufamumobupolenu.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160adfc6ed6d73---zexeginegagumowiwuf.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/45554013071.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/68028402617.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-30/20210430112153363529.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/c1a80a0990e6a3c90bcc30e3fd10b9ca/46309544896.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/xuzuruvuw.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/15997b4596f20082e51bfe46b953fd61/wamekovosokoma.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/gipamizuko.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/38663988391.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/wobosire.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160775d3ac30fb---rowaporasidedir.pdfIn PDF document text
    • http://sivam.pl/files/file/31718282153.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/defevule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=2+paragraph+essay+examplePDF 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_off0000fa77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA77 17296 bytes
SHA-256: 6ff22101fb98b9b3917f05c9e226768a0a7c317be7764ff81452008e47d4d7c0
font_01_sfnt_off0001277d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F94 10524 bytes
SHA-256: 30ce45afac534ae036ddfa9e1e5062e239891ea8f4fb3a43ef3e74889f334cc1

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