Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3473c60b3e93887…

MALICIOUS

PDF

76.3 KB Created: 2021-09-01 18:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 123e4b92a410c194a79e8696c8ae1d25 SHA-1: bdcc91b08fa05296b8f3c4b7a6085d3ea19889b9 SHA-256: f3473c60b3e938876cb3fc11084eab958e1241a42edc4a395bfa3f2ce6be00e4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious content. The presence of these links indicates a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f00a9deef34---mawolexovonegukaxixopu.pdf In PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/b50dabcc5320434bce0caf064975f405/2004366400.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/xudawusakerox.pdfIn PDF document text
    • http://fishingas.com/userfiles/file/48098949597.pdfIn PDF document text
    • http://ecole.ru/text/images/file/tadatadubexofi.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/bisugasofugariwefesuvase.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c458fbc4589---gebusogesakojofipoziduned.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/0b794d5bc7820fa0d99563077b8b172e/neditumalimuluwulopo.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/28213044879.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a9db2abf362---fipurigufujusewu.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607972ab40106---mozosogasugofudedulus.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/a90685302b1e59c261c4d291dcf73c17/89838986506.pdfIn PDF document text
    • http://danielbushreunion.com/clients/41596/File/67090717219.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/duzupadewujis.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/52121528828.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/535e007f68db47b6f3da2edb81645e0e/vefaviwupexag.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b73c475fe7---67099857308.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a0503e5a868---9674148023.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210530_011856.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/99515410162.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/8c7f80c88a0658e2f7b6098f4dce7170/90580777020.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/80572369143.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210822_E0985F1E5AC6291F.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/9bf910210f36ddc79561a52dfca5375e/taxaf.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/35908472113.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=chapter+6+great+gatsbyPDF 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_off0000c781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC781 16968 bytes
SHA-256: 5b914b74b8a0bed88dc6f026c4ee834691b310c2bf023d56c4c348027b82dd55
font_01_sfnt_off0000f346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF346 10624 bytes
SHA-256: 89fcb0a772f51049d10e2d7ab81ee239a5ff163f631e4fd217372a66d0c45a47
font_02_sfnt_off00010b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1