Malicious PDF — malware analysis report

Static analysis result for SHA-256 dabdb1ce0913e519…

MALICIOUS

PDF

72.0 KB Created: 2021-09-27 00:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3bf28d4a10410b8cec93a1ed93ddb15a SHA-1: 15819ca865892951024e2fe02b0bae67b11304d8 SHA-256: dabdb1ce0913e519c78a3b5a9fa3171d61748e4505be33701124a5c7c1263026
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs that point to various domains, many of which are associated with compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs further supports the phishing lure aspect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://smidgel.ru/uplcv?utm_term=how+to+unblock+your+phone PDF link annotation
    • http://martonaroniskola.net/userfiles/file/41331410639.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130152b718f8---19552144220.pdfIn PDF document text
    • https://la-klamm.org/Files/files/disomuvubiba.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/10963293299.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/22809636428.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/87395469067.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/talavapuweletukok.pdfIn PDF document text
    • https://cooperspick.com/files/23586547206.pdfIn PDF document text
    • https://combrooncom.com/contents/files/70060371316.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/pukugusadoviberimopekip.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/10522271610.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/77740804211.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419b97d0d85---nulelalodosajasuxize.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/78356152312.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/zegozojutulerafasivamew.pdfIn PDF document text
    • http://pk-rowery.pl/user_pict/file/kevofaxefojituxib.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614755bba16cc---pibidakadigobu.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/21613036613.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/43063867139.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109181527504831.pdfIn PDF document text
    • http://jamxmpharmatech.com/upload/files/pukiwavanebibetobar.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/92447036025.pdfIn PDF document text
    • http://blccy.com/userfiles/files/5812553995.pdfIn PDF document text
    • http://goldmustang.com/files/files/kujituvurojoxibibavetaz.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/xerosovaxidururinolurul.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/vuzomonit.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_off0000b675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB675 10572 bytes
SHA-256: 75bbf05a0a0aa1e101051e1d09bc6b69af4893cfcad84d45afbc180137de7269
font_01_sfnt_off0000ce5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE671 16940 bytes
SHA-256: afb8bb68f0aa5f3d63425b428c1ed566141943b25cc475d5978d0735ac004150