Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a9dae7bcd0329af…

MALICIOUS

PDF

84.0 KB Created: 2021-09-14 01:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7590b3b80abb77eaf292caaae5c2e6a2 SHA-1: 419cc147075d42a9e65e89edb1703163999525ce SHA-256: 7a9dae7bcd0329af11cd8f69054247504745c2a9b87b48627d10868136c56552
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure strongly suggest it's part of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://irlanc.ru/uplcv?utm_term=bts+wallpaper+hd+app PDF link annotation
    • http://jindi2010.com/uploadfile/files/rexarowi.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109070752592996.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/suzubuwuvezon.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/99840209646.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/dejoridavonavuzopev.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/9dbfc45c24cc1f422525abc008beccdc/36546185253.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/23137221945.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613167cc08ed9---27862610364.pdfIn PDF document text
    • http://roocenter.ru/upload/file/vimimegebu.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/bomilobibebo.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/85934375945.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/36609794586.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161313616c13d9---komot.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/161393a78e127d---7664128069.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/fewigilitabuwilopegol.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/48102633752.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4a2226690---9369314334.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161323078acfd1---kobug.pdfIn PDF document text
    • https://penal-garazh.ru/files/27897443108.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/20860170400.pdfIn PDF document text
    • http://stringladies.cz/userfiles/webidiwonujedoworuzumu.pdfIn PDF document text
    • http://wenxuezj.com/images/File/81977307599.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/99178104334.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_off0000e6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000feba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBA 10312 bytes
SHA-256: 1517dff6e9dee3e9ca779a58d3af48b1b7f861f18817d5ca8c6261e503c8379e
font_02_sfnt_off00011641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11641 17172 bytes
SHA-256: 94685f3fbfccd2f323477d76d5f9eefd7a1df5f14e0e8ae8d02107fabb86a72e

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