Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cfd4e3e86624ab7…

MALICIOUS

PDF

75.7 KB Created: 2021-09-06 16:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ac166c47369e093bc13570311c34cb94 SHA-1: ce9e2a78a55fbc9a3fcc582b81d5ace387d0be82 SHA-256: 0cfd4e3e86624ab72522bf4f467c5396907bb12bb5b72922e09fe2e9d4e82c89
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute phishing content or malware. The presence of these links indicates a likely initial access vector via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/d57267500dcfdcd98269a3d0804ba8e1/zopodedujenatifitokaraju.pdf In PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/156f1edce09175cf13baf769818cdbef/gababirixomaxuda.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/wegotonasimogox.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/46760669879.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/a39466b1a3e4c286157ba76fd4ada292/95808747525.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077e54f1d681---xejakosejitaxumo.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/73853fbc90fe2c5eb909f3535cd528ac/46193619965.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc14e56c90---pitifizimopapuvekebizusan.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210708164821.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f89a869f14---85482412046.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/gukowiwuditedafebofodefi.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/gadamiwijebij.pdfIn PDF document text
    • https://efnnma.org/files/file/wolimo.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c484414890---lukizen.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/3791955682.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/16600926246.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/85054340096.pdfIn PDF document text
    • http://fthyhs.com/resource/docContentImg/file/2021-08-15/3fd47995e99f5841da952c0cce106339.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210707_D11BB344FF1B5A0E.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/letuxorofara.pdfIn PDF document text
    • http://indecomavo.pl/inc/sasusarepapovamovuj.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/68978243011.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/89281194645.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/8d97ccf9446abb7b620eb7e3371c980b/wiwefisaluwumagogimavizo.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/5e94c6b0d714ca4cc4738d24c8a99f20/16433497659.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=madame+guyon+experiencing+god+through+prayer+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_off0000c173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC173 17596 bytes
SHA-256: ebc11d40f17a4788d6bc69ca38f4a4d807fbe7c4eed3ce2680240c116f6e6944
font_01_sfnt_off0000eeef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEF 11164 bytes
SHA-256: bb1f1046369c4b86147825833b7570d33fb63a171e32dd891163300486aa3308
font_02_sfnt_off0001089f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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