Malicious PDF — malware analysis report

Static analysis result for SHA-256 614cf56d314a0e63…

MALICIOUS

PDF

78.5 KB Created: 2021-09-03 02:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c50b325a40a6f601fac39e7f1159a3a5 SHA-1: 1cec10685c1e5df704e711182f940382b1c694ee SHA-256: 614cf56d314a0e635eeb838019c4520d475215138e34d5c25436a29f3d10df81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://philabc.ru/uplcv?utm_term=pdf+%DA%A9%D8%AA%D8%A7%D8%A8+top+notch+3b PDF link annotation
    • http://m2m2design.com/userfiles/xomume.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/nh9ai9dvdte5p3g3nia2cqmdbs/bowupinezul.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/48238049417.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/29960544571.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/36143959063.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/20235046042.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/45434795210.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/35497764132.pdfIn PDF document text
    • https://hirurgija.me//files/xovugador.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/nejununeri.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce87c8af6a---tavabatalimokudom.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/nemutubis.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/73017514399.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/93418326953.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c82e886285---xirisomo.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbaf8cf4ba---xopurofez.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/belijonozaxajexe.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160720826d9405---nudifopoboragolozenoza.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/15767019523.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/korotoriwu.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712a7902705---kusefikijefo.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ed5576df3---61967959340.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2b986124c---75658286094.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/57073158614.pdfIn PDF document text
    • https://basisnomor.com/contents//files/weraben.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129fc2bd03cb---sibonulavepanif.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_off0000c7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FC 17184 bytes
SHA-256: ab11adddba43f512408e4571a38a6561a203099f2c8da3d5cc718989e26325fd
font_01_sfnt_off0000e19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19A 19712 bytes
SHA-256: 316efea8aa1fc7675db3f758ef6e26feed4e75cbd2248035e785a720d15a7c93
font_02_sfnt_off000113a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A8 10328 bytes
SHA-256: 7f4a32714754c8bf0e5d20ff0767cb4ec7a830853ed779dc6560173211b7f03a