Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3ff0be2e7b4e00d…

MALICIOUS

PDF

73.6 KB Created: 2021-09-21 21:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a698c7d8dcbaaad0ecd0c2529409701c SHA-1: 4091512f62809f9b832e86d35e589e7280be65b1 SHA-256: b3ff0be2e7b4e00d37e29182a86499ec20613404cd9728dba19a9608eae41d85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://chcial.ru/uplcv?utm_term=overhead+limit+exceeded PDF link annotation
    • http://mevlanaasm.com/resimler/files/fefepefumejilerujejug.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/95540069147.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210907_061422.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/63782121343.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/nuforarizilexapamuvu.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/60920925239.pdfIn PDF document text
    • http://jawarakreasi.com/file/16086322416.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/wuwaramibumobubeluwo.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/jakemixaxegajegixuze.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614308ed271e9---29902466569.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/sawojakubogenujuw.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/53800061639.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/xipekefelet.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d31095dad4---kijawikikevivewokagevosi.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/kekagivamojepuvi.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/75869309077.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/tupako.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/67613397149.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/jmv04pui7nbgde149l256r1vdu/bujafatufurotinunosimatit.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/jejuwadopu.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/kemokojetewidada.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/mikatopuma.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/86898010618.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/konomoronepoxadakedekono.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/pufigedupif.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_off0000bdc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D8 16516 bytes
SHA-256: 681bb16bcb84dee9a4cc9b55d38ce61c15767608077a4509f786e5a537428b52
font_02_sfnt_off0001009d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009D 10436 bytes
SHA-256: 224d81f560e733d07b8882413f9a08f0310900347de10be51073c793b38194cb

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