Malicious PDF — malware analysis report

Static analysis result for SHA-256 46b98c484c3bd00a…

MALICIOUS

PDF

73.3 KB Created: 2021-09-25 05:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6158e00e350c08bd0e00b3e3f96357f6 SHA-1: 9701b49383b34097a40891675532f2a5624a6276 SHA-256: 46b98c484c3bd00a9e8f6ead0334d48b9797788214abc8e432f669dfd58a3c47
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=call+log+monitor+pro+mod+apk PDF link annotation
    • http://daiichihr.com/uploads/news_file/77590203305.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210905105310.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/3902329782.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/zelapegoniretabojudeno.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/60333380410.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/mofokakal.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/banozaperologas.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16141e2a464f90---23344718933.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614e1774cb75d---bamax.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/a55ao99c9pg498vp67is8eah46/27000278843.pdfIn PDF document text
    • https://proxkimya.com/resimler/files/67165078498.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/85177163479.pdfIn PDF document text
    • http://kes.org/upload/editor/files/mubifobukid.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/78166387034.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/jasatusidemiwafukazibedo.pdfIn PDF document text
    • https://laps.pl/userfiles/file/fufemadasivilaso.pdfIn PDF document text
    • http://st03.it/userfiles/files/68299814950.pdfIn PDF document text
    • http://stylekd.ru/files/tizabunebomulomobukok.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/74fca8dfbfcf620c455715155656febf/29118068149.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e0abf60fa3---pajewe.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/86561076823.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/46178945846.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/diwakujejadifakurizoporix.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/forowukimif.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_off0000b860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB860 10556 bytes
SHA-256: 86558d6f4525b6abb103c89d41f2580ba890bba0579439cf74f92829aaa14845
font_01_sfnt_off0000d024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD024 18324 bytes
SHA-256: 7b13c119345c7b3177c04cbefba234ea47ab37797bf0aa0dd00bdef826efc464
font_02_sfnt_off0000ff97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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