Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b0876c96da3ad4…

MALICIOUS

PDF

85.9 KB Created: 2021-09-04 12:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c479aede2d798d1fa52e302dc41b27c8 SHA-1: 76f1e98e913fa689e161ec1f66e8aaa670598742 SHA-256: c2b0876c96da3ad4a7f9b56f77fd4ba6281af72ba3a8b10e809f29cea50b7df6
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 other domains, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and UTM parameters in URLs suggests an effort to obscure the final destination and potentially track user engagement.

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://chcial.ru/uplcv?utm_term=oscar+awards+2019+list+pdf PDF link annotation
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/65c6643997902e7a31258e2a808ca971/pututaxesuwezibaxedonav.pdfIn PDF document text
    • http://hejia-ele.net/upload/gobadowupelidopokizuf.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946913d658a---titekuvunabem.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/6fd15bbb58caccdb72ffee4abaa9c0a9/kepoxelapomamugivivug.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c934f8b2abf---97275857450.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/90c0f742413a32ce1450ba5a712a5f08/5608258986.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/fifikubotujuruxuviwo.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6f38245a8---zejupabigoxexavulija.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/zilakiditaf.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/konokisajebufat.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/846ae63b33dfcf9806235a030249094b/lobutufizaxebosuxokuge.pdfIn PDF document text
    • http://tieuhocsondong.hoaiduc.edu.vn/ckfinder/userfiles/files/tolabodativalasebi.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161081490caa5c---vemiduvemam.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608174b46c78e---52011991881.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/88326739174.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021061605173180554.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/22e145845acf044a107e3d72b5f724d4/vebenekuvatap.pdfIn PDF document text
    • https://sapporopools.com/contents//files/denoxogebitajumumugogi.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c54f5e3082b---wedolanasubixunavefar.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/xidatanemopato.pdfIn PDF document text
    • https://digireg.dk/upload/50763079594.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/wovalavevemajixenesolobum.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/95136935388.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1628308646.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FE 10832 bytes
SHA-256: 104d49ed3987b6c3538702f107e47003112370952067db014c1c6053f8e2f94d
font_01_sfnt_off00010245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10245 18104 bytes
SHA-256: 82ce8e17071ba78020237a03471b7c13fa02830613087754ec96dd94fc452b9d
font_02_sfnt_off00013171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13171 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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