Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f0052b05b37dca9…

MALICIOUS

PDF

85.0 KB Created: 2021-06-26 06:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8da7a1f00acc457bccb1d0f4b820689d SHA-1: e96cf7519618573f85e8de36dbae2fa24357763e SHA-256: 1f0052b05b37dca9e189a2d426207d934f68e3beff023f4fa99e104d827dbe38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These links likely serve as a distribution mechanism for phishing or malware, leveraging the PDF as a seemingly innocuous container. No scripts were extracted, but the presence of multiple compromised URLs suggests a coordinated effort to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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=bipolar+mania+meaning PDF link annotation
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/2b706f40f0e96bbad685aa9e05e96f8b/53199848566.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a6390823284---17922723312.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/d3d7e8ce366a9f86c26265a7c6db515b/gewotunasulipasunom.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e8c48ca85773a3f7b2351e8ac997a618/77568378567.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c860ac1a4a4---11957526038.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/95bedcaa7b82a6ae5b74f4d2a86eb348/sipox.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/868110372.pdfIn PDF document text
    • http://maihome.hu/admin1/file/76814942088.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/ec9fb0b4a2d0d70094a8969f809e0f7a/vesatadivetowot.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/rb8484nen6c66nvu3eu7knd70d/9714307001.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/a48eb6365bbea3086818571d4fa9fdc7/44098964257.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16088965e650f2---zuwifexunisoba.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/94686129859.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/1l5rp7m2qqrgg9677ndklbhog4/48790758911.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/gexeniwosuniwopibes.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7e17ac47c---50500139097.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a0cc3f8b891376edda06d6391b2d344c/94575171282.pdfIn PDF document text
    • http://guowangcable.com/d/files/60725346443.pdfIn PDF document text
    • http://tcihk.com/userfiles/89843146865.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/95735734246.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/guvisozutebelovadevovajin.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/vodozasibokar.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb368876e8---lilaregetomoxadaj.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/gobodobefakipipodezuwa.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/jibobonelejeditizi.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e10d67627---68579908029.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_off0000eb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AE 16916 bytes
SHA-256: 2a7074a2e7bd379692cf149aba088e25274796f58dc3fb7a206bfb259c5c5b15
font_02_sfnt_off00012f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8E 10380 bytes
SHA-256: 26cc806be8bcd47ddb3db1c81c34a88ab2ce5be6e864b5a3c11ce7881a487fd8

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