Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff5bfb4cd5a7e9a…

MALICIOUS

PDF

87.6 KB Created: 2021-07-21 15:41:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 169a77ae2ea66aa8e6a40ea0254e29f9 SHA-1: 0234abb9ebc1b81393c92edda0e6a95cbf264cc5 SHA-256: eff5bfb4cd5a7e9a56d504dc674b38cbc0a77010f7fbc7659d61b724acbc8e79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further malware. The presence of a link farm on disposable hosting further supports this. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://harasim.cz/uploaded/files/12674656097.pdf In PDF document text
    • http://steakclubhn.com/campannas/file/16650157606.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16094c85a7a2bc---runifidafomija.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160850214a9755---tabajeve.pdfIn PDF document text
    • http://africareview.in/userfiles/file/67080302155.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/rujilewififekusajif.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/42355908798.pdfIn PDF document text
    • http://www.asslar.de/downloads/22130742960.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/18bec71d8a87f67736a5c7e7748cb387/bosaxopoxebalatinevir.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/gkjv8813svhjldk0s1eq3hjlsl/56845686651.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070d4f71b25b---89902849973.pdfIn PDF document text
    • http://polkovnik.su/upload/file/82217074440.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ade37e24a39---77342801914.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160835a0449594---xagewukixojudum.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/lejiriwomugurewopoxew.pdfIn PDF document text
    • http://kclandscapes.com/ckfinder/triplebuserfiles/file/fatutini.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/uf6fkm1n5pgnudgkhvjic8plj6/duxogole.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/susoxuxijerogir.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/f0jpp33eariv54vqco5rc0p7a3/xexeforilariraduduxokes.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e49c21be933---3007445017.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/uusn6nks0sucgke5mssr855ojn/33231398508.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/ledus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=infection+game+unblockedPDF 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_off0000f20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A22 10836 bytes
SHA-256: 03f46383200a047b97ad045b6462337e01638831f46ca8d07d9c84c891eac2fb
font_02_sfnt_off000122e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E8 17252 bytes
SHA-256: 9168ed00323313e7155d55503c94bc8ed8d8cb99265cb6939fad1522721b43d6

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