Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e57f57f0e2da82…

MALICIOUS

PDF

72.6 KB Created: 2021-09-24 02:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cfaa5fe71c233557670f5314fee0c9ae SHA-1: 602748ad274f1bafbf6dc3d0e8f9d9327d829def SHA-256: b7e57f57f0e2da82e257737cf026ef3bbb795c768e4d031f4ef0efe6dc3a358a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised CMS upload storage, suggesting a link farm designed to redirect users. While no scripts were directly extracted, the presence of these links and the overall heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134f9316386c---magovujin.pdf In PDF document text
    • http://www.petercar0937494634.com/upload/img/files/85711592339.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/57899734589.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/vorisaxalifanosufaluxuna.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/lalaxapujo.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16146bd4da0b89---28385896478.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613750e3af15e---41112898060.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/90349303611.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16147a28bc9637---6552098584.pdfIn PDF document text
    • http://trieuduong.com/images/Download/4695634821.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/75246102049.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/6957923624.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/df8747451c1442a6a0cbed618c9de221/fizegavijuxiwenetukud.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/49132914249.pdfIn PDF document text
    • http://ilovestory.com/upload/file/42541146957.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/ziweruvugafemagiv.pdfIn PDF document text
    • https://bor-diing.com/upload/files/46325628710.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/80230998398.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142652c80cf9---wagavowivadujowurevived.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/81489549545.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/52821962383.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021090822523896.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=oversize+love+watch+onlinePDF link annotation
    • 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_off0000bb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB5C 16256 bytes
SHA-256: 01fe584fd7e4a15513d33008fb27cf874afb30791f56964ee7f103a7d5477ccd
font_01_sfnt_off0000e4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FB 10564 bytes
SHA-256: f9618a5347afc7cd0ccc5fd26c7ff8a72bda094fde07f0e39c6b340c86c14c36
font_02_sfnt_off0000fd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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