Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f6de371b9b5147c…

MALICIOUS

PDF

74.1 KB Created: 2021-09-03 10:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 60af5032cc4a31f26b45a2ce56339d9a SHA-1: 5e572594a7a89cac3514a18037998e883b9d48e5 SHA-256: 5f6de371b9b5147c2bbf1663009d0d6d21a711cc43f1c2e2cbef2786aba4963d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869bfeb7a1d---25208510396.pdf In PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210528023617.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c16201b24---62456017860.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/l8s1v6l3muclloqaa3ljfdn263/fetifir.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/37838346237.pdfIn PDF document text
    • https://5uempat.com/contents/files/81351226318.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/e7t8scrs6q3ubrej0ge77s6n96/wipatosenineletafa.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210903_100E11DC7E708D68.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/javitexowe.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e30fc10e3d---49164108876.pdfIn PDF document text
    • http://kuppersbusch-center.ru/uploads/files/49885992865.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160c323ffee5e3---79320958018.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/31310352353.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc4a77d3d6---63410878100.pdfIn PDF document text
    • https://asiahijau.com/contents//files/27889367240.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/c7d1ca77f17fd563b96d11ffa522d817/34750853276.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/9062e61e859ba71239d59d7b84c72906/lelasodajaxatevukabos.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/narotu.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/katakixokilinakezazulojo.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210704144417.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=star+health+insurance+hospital+list+in+lucknow+pdfPDF 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_off0000bdb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB6 11072 bytes
SHA-256: 064bf19fcf607d8d0c6e8db61cbfc77a47d03390bdacec1e1020cfa4cfb2ddd6
font_01_sfnt_off0000d778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD778 16732 bytes
SHA-256: 48cbffb8c8bdbf2fdd19a26c16c22de2d124e5a81e98879beb04ec2d6d004bfa
font_02_sfnt_off0001028b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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