Malicious PDF — malware analysis report

Static analysis result for SHA-256 832e307e6e7e1577…

MALICIOUS

PDF

81.1 KB Created: 2021-09-06 07:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0a5e402169bbb2f17b0d571f9ce0ec26 SHA-1: 97ac0a7e56369c7bc142e956f1a0c167149d7607 SHA-256: 832e307e6e7e15778e455e78ceffe2ce0b64568a18b6032af59e6829e2e92e78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of multiple links on potentially compromised domains suggests an attempt to leverage SEO or distribute malicious content through a variety of avenues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612d6f8f4c1de---52662458295.pdf In PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/jemepubiwebubasitete.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/xigakafafusetibofajevofox.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/6336935486.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/eebf272a7bb974f98828789b7492c9cb/97318672404.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/b113bdc48e570c24f6d2bb5654b62e69/16349624016.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/kovibigufanexurel.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/26836267679.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/20093551709.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4600c8c66---26444441979.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160aae2d4cf549---62718188380.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac82ed6e8bf---90456813320.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c911bb4eaa---turavulawuwutidibufirivav.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/295jakcnojs182d3hdcohhbtvk/48695616775.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/43c92f323f305fa7f094678229572024/58742328442.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/mexuwe.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/52941539761.pdfIn PDF document text
    • http://poiskvod.ru/images/file/51608427155.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/b1752c946293053faf9eb813af33a8b1/56808714141.pdfIn PDF document text
    • https://guijek.com/userfiles/file/rafutonaduxoguzap.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/jisajojatelelopogadu.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/jobumeniminimesajawiduwot.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/feluguruvifidax.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/57441643167.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e3283df5d---75391104868.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=dna+extraction+procedure+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_off0000d749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD749 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5B 18316 bytes
SHA-256: a8939e5b62b42ccd7579f408b9247cb4f10802101db7c05c8f8772fb19cb3089
font_02_sfnt_off00011eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB4 10604 bytes
SHA-256: f40af44afcd1806e227c98c8c1e367a321cd499c01b57da6b3da3b519db32cfe