Malicious PDF — malware analysis report

Static analysis result for SHA-256 6278af658c6057ea…

MALICIOUS

PDF

109.6 KB Created: 2021-08-04 22:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 46e7012360cded46ce988714f0543272 SHA-1: 15f5bf12dc01801c5edd5d30edeca22c8f9574ae SHA-256: 6278af658c6057eaa0bae913d30e26e9ec4b93f5e7568e9536b78317941a4611
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to other PDF files hosted on various websites, many of which appear to be compromised or disposable. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and link farm patterns suggests an attempt to obscure the true malicious destination or to create a broad distribution network.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/mnunoi7a5h93chh5607q5fbk9h/82837105459.pdf In PDF document text
    • http://barbusci.it/maisUserFile/file/45964306693.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021052015540683.pdfIn PDF document text
    • http://ashioke.com/images/library/File/bajiboverojiw.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/dv9opl24n559qm22lnl9crtp80/morefuvafavakedifajane.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/15728818391.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/293378a48288a11b36cb0c562cc46aa7/pibetazukiwi.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/rusotupotawizezi.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606f34667a025---dajulidosaxiriromulo.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/40fc3899e4ac5d8c8f5aeb8731b8e219/wemewamixuro.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea2d8a7d05---gizuxudalezazoz.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/6b47f6105d590ebbd08601f88711c27b/13918270091.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed98642a69d---jipep.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/hqnj0reb2binluo8dokp0386g0/96427617890.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/j40n1k1d1b8n858aj414ubpbl3/81547717539.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/62446842854.pdfIn PDF document text
    • https://edgecs.com/documents/72253870733.pdfIn PDF document text
    • http://isvpro.com/custom/files/sivisatejowa.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/cra3cli2kv8f5ng61he8r90ccu/dexodojepupuzufufakuxituw.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/75689969231.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/kiraboxa.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/kajirunusejupimu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=general+knowledge+questions+and+answers+in+marathi+2019+pdf+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000130b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B3 11872 bytes
SHA-256: 0549104ea3ffca5c1efb03134bd8f9eed81258c9f3d5eb378ee0fcd33f0a1e32
font_01_sfnt_off00014c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000164a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164A9 16064 bytes
SHA-256: 6be8c0c042521f5a71df7666660e0ab63b9e07567b17aa495b0122ea571483c6
font_03_sfnt_off000179b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179B5 17672 bytes
SHA-256: 614d3e78df0c5e51ddd6b3a778e25f002b9563cb97c8d165c7903f64fd98a5d5

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