Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec0ab516980898cf…

MALICIOUS

PDF

98.6 KB Created: 2021-07-05 02:37:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ab5f0a80e033416bf95a63e43463359a SHA-1: 60069481e7653c6dcf785e429d82551f7ccb6280 SHA-256: ec0ab516980898cfdf45dcbec58d681d0b440dfca1deb0ea5eadb3eaf0eef478
176 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. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting it's part of a phishing or malware distribution campaign. The presence of PRC/3D content and embedded font streams are common in exploit-laden PDFs, potentially leading to client-side exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9704

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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://oniceh.ru/uplcv?utm_term=the+sheng+instrument PDF link annotation
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/54694ec4dd3fa0a9d8b691ef217c3ca6/xavunufi.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/98e2bdbae3bf49f73741723aedcb1194/28108424638.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/f0598cce37254701cdc2ad014213e418/laguxuxuponoxebijosu.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/42452510020.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/enf7sgk5c9o4863tjtlv013t7p/lozipu.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c40e810c36a---voxirubejojaguzemumi.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/55709673466.pdfIn PDF document text
    • http://olneyjune65.com/clients/d/dc/dcef5d22f85ec69f5810ba62c2e8cf46/File/44750636977.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f60ca66b6---zovixuv.pdfIn PDF document text
    • http://klpa.net/userData/board/file/89588363839.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/03dnff7f8elhfv7gme3tq86tve/26172079729.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/1ae1d2215a1db254880d7f6f4845d47a/pedapato.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/7cbab0e9b2e4398a1a0939b80f146f3d/puxugawujojuwirerokugafa.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607946d2ab05f---rusekivekex.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16085f577310ad---7277234132.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c194fc9b5aa---42931804071.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c67e4559a1c---tuteditifek.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60fc324227---81719582010.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/69fe7f31e9248ee02e4a8706ff5ccfac/32544395082.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/78436175587.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9c0b7ac34---64191763022.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/e969c7c1743a9eafddd0a5b7756e91cd/31914604739.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/pasarajuwowotemapuwed.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/26417630281.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210628171223.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/lunibivovibikajulibusid.pdfIn PDF document text
    • 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_off0000fec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC6 10288 bytes
SHA-256: d08f57a04816a91e3a6e1e81a21c0820344cd91390da30c8607592665272c1fd
font_01_sfnt_off000115b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B5 9100 bytes
SHA-256: bda78ef740138b085883d8deb4f2c9d2c844b9b6cb3a796c23d2096061e531c0
font_02_sfnt_off000132f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F5 19468 bytes
SHA-256: 3bf6349d2698c69a41c58c08deecaff6083f9b1e66bcc8b48fed60d7cc3ad821
font_03_sfnt_off00016511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16511 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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