Malicious PDF — malware analysis report

Static analysis result for SHA-256 cacf9dbd6be75676…

MALICIOUS

PDF

69.5 KB Created: 2021-09-05 22:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0d1b2da1eb29405bb244ff2d32c86c37 SHA-1: 37a02a29fe808cb9fed80e2e6294d349b97196d7 SHA-256: cacf9dbd6be7567662cb1df86e94487f12b85fe68e28e778531696a47d531ae7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised or disposable domains, indicating a link farm designed to lead users to malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/78721845418.pdf In PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081fcf9a02bb---polifitubili.pdfIn PDF document text
    • https://vestol.bg/files/file/rawirusi.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/90kk0umudlnm81qbgs69m3b0c2/vebonekovererilokunonas.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/f378c45960ac9ed0c1beb2063335674c/81974614670.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/nojekalivogumorinopew.pdfIn PDF document text
    • http://teplospectr.ru/images/files/fiviwizononabozasaridavi.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/getugus.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/acb1fd2f6bd53229b3992da6dc6916b2/wigidutezoti.pdfIn PDF document text
    • https://banghenails.com/upload/file/gapurejesuwono.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3af4dd2d1---jirexig.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/botefosiba.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ihjt5isai716vddqd2civcotr4/nudujisukiva.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/tavitikekifuwuviwu.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/72074371732.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/2e41ec7b0e28be01862cbf0233afddb6/guzeta.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/rdhs8vado86sjgbjuoivlbgc16/fuwukatevaj.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210624124859_0oy3ok.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/c301fd83b6cd9319eac625ed488389f9/90049203585.pdfIn PDF document text
    • http://alcantara.cz/data/file/40767121698.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/87f7147fc0c328e7bb1f1862d43cf27d/zikenuvajiz.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cece3c139e---34844593395.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/mexetovevimagefi.pdfIn PDF document text
    • https://hoalavender.net/upload/files/baluwonawobixirevemex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=guitar+chord+chart+for+beginners+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_off0000b2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD9 14392 bytes
SHA-256: 87bc6a661e7bb735726abe39d96137d7dbdce1e06f8b087055373ad312c869fd
font_02_sfnt_off0000eee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE0 11132 bytes
SHA-256: 64f6d06235e97d8ea62486c29d48789b423e8cb343a548dfb894bf20a3e96aae

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