Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b9ec7dad7c5e95a…

MALICIOUS

PDF

77.4 KB Created: 2021-09-04 22:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cd4ff697877aaa376aec0883efdfaddc SHA-1: 5e548f176cbee99faf94254217b61bd4f40e314c SHA-256: 6b9ec7dad7c5e95a1b324548236cc5d1fb5c030ba461547f8b6a4955046ad620
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and a link farm indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://krisoc.ru/uplcv?utm_term=death+certificate+ontario+pdf PDF link annotation
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/rotixudokesokurowokezo.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/vuxoxujipibize.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe30849dbc---lidete.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/lopelixikimosotadixef.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/88fb3c5f7190123d8ea55050ae82ba0b/5025155386.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/33652933065.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/95354187490.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/vezawubu.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/2d03d7cd52f5a7cc838c4f7ba0c51359/69337435449.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f671ee308c---15313013284.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/65680370710.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/janonuno.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e2baa939c---22074592083.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a521e0e1ed5---22221829689.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/25148879799.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/jasipawilabijemilizuz.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/blflqk210e8sc5tqq6m5pjjoq7/51053478498.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/40182398695.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/vaxazupibiroxoxemuz.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5b1a42d7ec---jasotebexuzaxixiv.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ef6393479---pukefadut.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/56671082725.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/6c9cd8dce2a3a9ddb6b45a75cda83e79/91205365372.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_off0000cc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE484 10504 bytes
SHA-256: 569281ee7c35636a5725dd290a82f065fe19d4cd59bccef6fe2337246a5f4210
font_02_sfnt_off0000fc51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC51 16960 bytes
SHA-256: 9af252bf85383b27f8c6bc5afea6fa042fdcba8e71905c7729e7959f5ba2fd37

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