Malicious PDF — malware analysis report

Static analysis result for SHA-256 79098e360ba0a725…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 06:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 28acb87eedba89cd7faffa237b757d30 SHA-1: 3b9a72f3488cbfa82a8ddc468786e1483095195b SHA-256: 79098e360ba0a72580e55e1302f8b4fa8a0fb0182077fca3fd225b5bd7d94f41
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 identified as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to redirect users to potentially malicious or phishing sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further suggesting a malicious intent to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=geometry+dash+mobile+apk PDF link annotation
    • http://xageunion.com/userfiles/file/23911735493.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/noferoviligawajadufiru.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/gewuludubupifabijanu.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/97695353922.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/pibixubatejewukigot.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/wogenafovusenugiva.pdfIn PDF document text
    • http://millecolori.it/images/file/90679443437.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/noganetelopolesetiwepexe.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134010c07339---37245847637.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109140024567426.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021091305372194.pdfIn PDF document text
    • https://zzhqhi.com/d/files/95344357425.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/10282af3c326a1dbf9d81b78c6fa2cfe/53624117178.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/38274617751.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d883a37783---66753612852.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/supewiruxutadufiki.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f91b925f6---86820330111.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/10612921239.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/22178010394.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161347a765887e---37065287888.pdfIn PDF document text
    • http://kahsport.cz/userfiles/file/73766213285.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/8399326407.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/54962728127.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/tafoke.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/xatekamazogoxaxiw.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_off0000d79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB6 10940 bytes
SHA-256: b7b1be6f2c7f3f0c172505d9e6cdaff478509e89edca7d953308812b6883820d
font_02_sfnt_off000108de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DE 17688 bytes
SHA-256: 5bcba1ea07f013aafe2d1ff9f2fb63464e72a42eea0bbeb56336fc4220136629

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