Malicious PDF — malware analysis report

Static analysis result for SHA-256 098ceecfcad26fdf…

MALICIOUS

PDF

90.8 KB Created: 2021-09-05 12:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a6a2a60f2b1941c6466938fdc1a5c6ad SHA-1: b910c4b59d21bef16cc01a22e439b10e12fdfe4e SHA-256: 098ceecfcad26fdfa189c912be5629f68dfdfc19af1fd6460b782f8373254143
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to PDFs hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The 'Urgency Lure' heuristic further supports a phishing pretext, although the specific content of the document body is unreadable due to encoding.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://adas-muko.pl/photo/file/dojolatipiluw.pdf In PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/22270576026.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/ac1b3e44978d688a0aba50cf65bc5998/dejorupisax.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/76801773962.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/54959659153.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/wekemig.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/jasito.pdfIn PDF document text
    • http://mweb.cz/images/file/22296085730.pdfIn PDF document text
    • http://bosch-service-center.ru/uploads/files/95416768320.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/kifof6v57g480c8r9nf68sf33j/85078190492.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/h4egte3acphn1ulpqi2rhi8rit/ropaboguvirolutemonematel.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160766a1b51c5f---kagizepanixedu.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbde632688---27837051869.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/gaxawexifusedivenetalobaj.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/50918531070.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e2fff2409---ziwojar.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/67782698592.pdfIn PDF document text
    • https://tigapilar.com/upload/files/fexinileluxozij.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef851b3d04---15275614642.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/40305103057.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-8-30/20210830185925142297.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d56c88ffc---jamomofo.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/54613958525.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/niritapeg.pdfIn PDF document text
    • https://jjpremiers.com/files/rivojabujufa.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/xamepenogivutopokorilu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=customer+satisfaction+project+report+pdfPDF 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_off0000fc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001145d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145D 18368 bytes
SHA-256: f4ea9c3ba8cf8e30833e8a16145df9118706a12023955402b5489691b0527e0b
font_02_sfnt_off00014413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14413 10996 bytes
SHA-256: f1eb01b89bee6d302a35a9fb0cf37e290470eaea351b2ff6bca5738a255ad4b9