Malicious PDF — malware analysis report

Static analysis result for SHA-256 a50cf49cf19a816e…

MALICIOUS

PDF

70.5 KB Created: 2021-09-19 07:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: edb46e7c6a8b316ccf81668bd902773c SHA-1: c028fad21f07682e5faac73b1dd622e542aaa12e SHA-256: a50cf49cf19a816eb3dde353fbe543f9a226103a0ceb854e3dfa1db5b35bd4e0
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs point to compromised CMS uploads and disposable hosting, further supporting a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://drafthe.ru/uplcv?utm_term=best+pokemon+go+spoof+locations+2020 PDF link annotation
    • https://appchecar.com/ckfinder/userfiles/files/bewapajurewosozuzoxiw.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/49536884990.pdfIn PDF document text
    • http://bresky.cz/res/file/10264666975.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/cf8ad283fbb9db23a52c08bfa72216c4/44378331628.pdfIn PDF document text
    • http://klpa.net/userData/board/file/mekomasixowoxatojuf.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/batunif.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/23443163629.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/romevigazixilimileruku.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210912_24F0E1A5074A99EA.pdfIn PDF document text
    • http://stl-hk.net/userfiles/xofovoridul.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/72073742843.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/21457737411.pdfIn PDF document text
    • http://levotst.com/uploads/files/tafebogujelavobodesu.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142de06137bf---gimixasidefara.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021091804020973499.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/bemovopezigapubi.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16145822debc2e---ranafizamesolefone.pdfIn PDF document text
    • http://tochuchoinghi.org/files/ziposi.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/ligugotekibabika.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/dipalizagovalu.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/74269281976.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df9f9e373b---92285695842.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/luwunota.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/nolanazupixo.pdfIn PDF document text
    • https://medpressa.ru/files/file/xajigipixedid.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/sosewa.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_off0000b2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BB 15700 bytes
SHA-256: ee9015a156635858403f473ff189a09050d20defd3ba27457cdcf40d321ede1f
font_01_sfnt_off0000da16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA16 11108 bytes
SHA-256: e8bfaec3d80363d9cd7b3fcdb5fb46d468f3a320edfc735652ec17d9ba392955
font_02_sfnt_off0000f424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF424 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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