Malicious PDF — malware analysis report

Static analysis result for SHA-256 6edb16dbbd132b2d…

MALICIOUS

PDF

84.1 KB Created: 2021-06-29 03:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 951165cb434a0fa91848a3b74102d249 SHA-1: 2a3daf7992d40703b82692662d6653f2a17581bd SHA-256: 6edb16dbbd132b2deb3fd75bf4d3edeffbcba1fcc9adbf410edb67292552c71f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925c640c082---vumumabalekikadafefi.pdf In PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a20d2cd8b22---wofenipugikimolutokabi.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/gerexutu.pdfIn PDF document text
    • https://vieclamkinhdoanh247.com/upload/files/91081714337.pdfIn PDF document text
    • http://allycatering.com/userfiles/347733534.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160757b11e1c25---68261447858.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/0abf03f3ae81b35f774fc05c2e553bc9/wiluvafugemozawor.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/18389313805.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/60917315415.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/janifumisarigerusozire.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/5505870794.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/7f698dfc8d709c8348f4103ccdae36bd/17994815712.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/72094978649.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/gpolthblv45p9b36h9mkd6hv1q/97910544344.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/85272069531.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/71052605358.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/21419928896.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/7556623250.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607743a066617---59818706615.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094055ee93f7---renepezerozumad.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/a419a743c6fdd0bfa409faf821c2b70c/xaketibujuxiwulo.pdfIn PDF document text
    • https://petikdaun.com/contents//files/gowatolotadonudalirasoz.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/6f63664fc45d74a9ff0685cb3a16f7e0/73833272047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=fine+as+hellPDF 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_off0000e9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AB 16488 bytes
SHA-256: 42f0a685c2a1d47fbfcb5dbeb7ecbcaf050dd84ed1ca6fb6726d9e5a4e795095
font_01_sfnt_off00011469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11469 9864 bytes
SHA-256: 356269b32c2fbf0d47e5ebc930729244ed85db2c7eb6aff9b43b1f2c33573f69
font_02_sfnt_off000129ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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