Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd5fe1f5636e905…

MALICIOUS

PDF

84.1 KB Created: 2021-06-29 11:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 63781e16907716936e66e72b5b6b04c1 SHA-1: 608398a754103e2f2780f0142bc476866b1ac226 SHA-256: 7fd5fe1f5636e9057452fb94c6a6807b902125d7bdaa8ae79d949dfd8da0d83d
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing an embedded JavaScript stream and a link farm pointing to multiple compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to execute malicious code, potentially to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://arabacioyunlar.com/calisma2/files/uploads/tabikaxoxerakixuxodufavoj.pdf In PDF document text
    • https://www.alapan.org/fckimages/file/dumabegepojikinexuxixibav.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/35917233471.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/8ici16kug7005lnk2pgp6ih5c7/36022256077.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/82365acc4567a9864b605177f6ca231f/70956399927.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/linalowebetezisi.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/72377842174.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb21b30b1c---94593858817.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/tedapiw.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/1c2fcdb44554ff112ee51472e7530060/69785171627.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/56438916089.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/27ea25e2aac9a6f3e489d63c08a43f29/6769263512.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/xafafimewe.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/kifesitajurixo.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2d022cc3e8---xadejoja.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/5a957fa7db5a19afca1eb453063fd4d3/17933280836.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/bimilasonivagevas.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c1a4b1d76---23261667859.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/20181531220.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/b2d4211e0cad335271ffc1fc86d841a1/16018032861.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/mudutipegogezobidix.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7ca230c3a---wevesijivimowem.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/0a301fc0640776a102ad329335130679/sobuxike.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/rofoputulolemugisame.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210603_8D5D52B9F76CB3D6.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2058c96fb---fevoratomanowikadagalew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=ucsd+geisel+course+reservesPDF 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_off0000e3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CA 10356 bytes
SHA-256: bdcc64c0e766d78f8fd687668372bf104b8480e7ea3536fcc3e404944bd00291
font_01_sfnt_off0000fb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0A 18076 bytes
SHA-256: d86a60fc89efddcc453e0c97dba78a4a1a33770e5e948809097d87d96b879678
font_02_sfnt_off00012af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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