Malicious PDF — malware analysis report

Static analysis result for SHA-256 204dc5d7f34cb036…

MALICIOUS

PDF

86.9 KB Created: 2021-09-01 08:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8200a7a6713f7ed91c72f14467142098 SHA-1: aa14ecccf186fd3e4457d44f60c9f02d8a8f8585 SHA-256: 204dc5d7f34cb036a9b569fd26e4f59b11411c5ad3dce29e24dac5ef577df88d
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous other PDF documents, many hosted on potentially compromised websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for SEO poisoning or phishing campaigns. The embedded URLs suggest an attempt to lure users to malicious content, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.groupe-coelho.fr/ckfinder/userfiles/files/28630727629.pdf In PDF document text
    • http://topstec.com/d/files/zexegulasekesovesatov.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/97754859012.pdfIn PDF document text
    • http://dlikefulproductions.com/clients/875850/File/30277682865.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/munininajurapawag.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/45uonddum8us3hdheoelrdq6g5/tekukubowiledezo.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-10/20210510040123139897.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/vidaxatazitelu.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/387838019.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092ad1dd8c8a---91584321032.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9d19rmio3sqhv31afarthj1ua7/pezekitoditugefavimabasa.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/86643836959.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/wipamasolapumazopufoso.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3e25b2c44---pogines.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f724f04175---xolomivavabapoxoz.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/pidet.pdfIn PDF document text
    • http://andrewsexes.org/clients/867461/File/91729999014.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/71213189535.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072cf2356ea8---zagivifedugunurazuzexofer.pdfIn PDF document text
    • http://reneenicoleevents.com/clients/865995/File/lozebeferifowudexul.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b728b97e44---96618511016.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/10480990517.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608190bb0cd35---46925897731.pdfIn PDF document text
    • https://ahha.az/userfiles/file/tujozokuvepolo.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/1e6ae4170b6f6abe82ad88cf3659079d/46615562412.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=kutools+for+excel+license+name+and+code+crackPDF 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_off0000eb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10374 10920 bytes
SHA-256: 4a2c376c8d11a0ee4684b99284cf701abe1071fa751383a278573158e93eec40
font_02_sfnt_off00011cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC5 18668 bytes
SHA-256: e8623d4dc6f03cbf6bed02cc4c9367fb046104cef5a399217380c43c8c362e39