Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb05b5a7d855e3dd…

MALICIOUS

PDF

90.9 KB Created: 2021-07-19 19:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 92f05ca4dcef26f9123457d0d9da25e9 SHA-1: 316a3aafe7a62b1c6a95f1c15f76c195d8bb72af SHA-256: bb05b5a7d855e3dd995fabc9ea2e2169dbbd4bb07aeba86dc868655f55e7fea9
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving exploitation or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://fonnepal.org/userfiles/file/nivinidibes.pdf In PDF document text
    • https://nevisnews.com/userfiles/65476179845.pdfIn PDF document text
    • http://jarosi.hu/files/file/surepurokuwufini.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce27e6c4ff---42426495260.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/58565242710.pdfIn PDF document text
    • https://scapetime.net/images/website/user/files/62203528324.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/50358040429.pdfIn PDF document text
    • http://tate79.com/clients/868750/File/45364871433.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/0e46rroivi2ma0r5kaaqtpajrm/zadukesulurevimusum.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/10637239554.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/90265517720.pdfIn PDF document text
    • http://skncn.com/u/files/20089062850.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/zelulozeza.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add49319249---logilel.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/dd3758f3bfa95a3eadfe1e12194111ce/79539434961.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7044332960.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/754da01b45398d50388c1fc4fbe0f8b2/95543171355.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/0hn8ab03ikp5jnth7qbrt1vls3/28342683962.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/99922404654.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/rozarija.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/37910089647.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946d7e38103---9484615788.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/19295712525.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/tdmhf69ni96q487vcs9lcdalg7/17851333884.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=introduction+to+mass+spectrometry+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_off0000ff83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF83 17244 bytes
SHA-256: 6adb6cb76b5b687209a3c96160f2f0b5b36d0d63fd410d5c6ed7407c9a002e58
font_01_sfnt_off00012cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144E7 10900 bytes
SHA-256: ad36087f78975f8ef87bbfb4381071bbead306a371d259f7ed8affc1fe8bf661

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