Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d0879c32d2adec1…

MALICIOUS

PDF

71.8 KB Created: 2021-10-01 10:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9c9e8ca8c71eaad14df4172e987916fd SHA-1: 14c1f0752cf293a2e78b497169059aa2668e0093 SHA-256: 8d0879c32d2adec14ed55b4889c64453f23f3b8036fbab79890eeeef6d85a653
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://tobolsk.fluentrussia.ru/img/content/files/mezobin.pdf In PDF document text
    • https://goooinggroup.com/userfiles/files/20210910_082138.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/40259782673.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/bezapasavewetofezususo.pdfIn PDF document text
    • http://all-premium.com/user_file/files/43805880317.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/lodakalozimoparefoz.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/8f945ccf9c2c8ae66b78eb2c06b2813f/11352731907.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/vokore.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614599af63e21---85955695480.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/92895345980.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/94627883699.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/74681819636.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/kixegizonipuwemenitukaj.pdfIn PDF document text
    • https://thietbigas.net/media/files/82241871367.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/58726836227.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/lexekisogofimadiwidodi.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/46963101712.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/83402456166.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/34175163243.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/91479076445.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/wurafokotabevofig.pdfIn PDF document text
    • http://gnox.vn/upload/files/mimisezipazojivunuxexiv.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/3a8e53125bf065d86b9876336907d14c/momaziviruwijonexewixawov.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/4821647315.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/sejabonisovukavugopulu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=captain+america+super+soldier+apk+downloadPDF 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_off0000b5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F7 16504 bytes
SHA-256: ffaff4b5d0a2c94529ebf2d2a5300b6807c68f67104ab5d21a535155bfe392ed
font_01_sfnt_off0000df83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF83 10984 bytes
SHA-256: ebe0126e9ad509ca372f9a6ae7626b5c09072490f3baf7d8dc632c09ceb26dcd
font_02_sfnt_off0000f912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF912 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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