Malicious PDF — malware analysis report

Static analysis result for SHA-256 f40e6069764c147a…

MALICIOUS

PDF

72.3 KB Created: 2021-09-07 14:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d8d54d8fb189ce508c2058579053f3cf SHA-1: 3080367a475c54580cbad40cfd1d59cb185aad54 SHA-256: f40e6069764c147a6ba3488490093ea66ac650e60f4739b1289e3dbc9c0c194b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites 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 distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://huntic.ru/uplcv?utm_term=mid+ocean+ridge+basalt+pdf PDF link annotation
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082dfab9544f---vaxovejus.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/tudopapuforatigakapilevi.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4fe9a376c---38929574074.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/wunapenimeminonozizesi.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/37242603871.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/bilapevuxepowida.pdfIn PDF document text
    • https://rcot.org/userfiles/file/barekegipaxotomabax.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/pubaxosawuwodalo.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/semilifubanuripupepo.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc0b33a2b7---33219769399.pdfIn PDF document text
    • http://centrumbiznesurawicz.pl/userfiles/file/zabikezemowisumofaw.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cc984b8a5---97598131588.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/f07286fc1e11d4eacf06de9ad5a3f31e/furomerexunojagozixup.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/90820300586.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c68723494---46237401685.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/17385906054.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/tesirowivurikex.pdfIn PDF document text
    • http://kurpinar.com/img/userfiles/files/nofikunogilipexulesibipi.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/pusomatukopifelawiriwuwaz.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/21518604617.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/33329220423.pdfIn PDF document text
    • http://capital96.com/userfiles/file/kovikumedinizijuk.pdfIn PDF document text
    • http://aps-mes.com/files/file/55661877185.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_off0000b8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8AD 10928 bytes
SHA-256: f8e78279716969d5472b4ebcda9403157dbfc9c15ecba5372cf5957ca8384854
font_01_sfnt_off0000d1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A5 16284 bytes
SHA-256: c21398f03ef70812ff2fcc3120deb638c2668c20635dea076a99d0cf914df570
font_02_sfnt_off0000fb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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