Malicious PDF — malware analysis report

Static analysis result for SHA-256 b52a649c317462d4…

MALICIOUS

PDF

81.6 KB Created: 2021-09-12 18:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b58681c7368c2059627559c9bba82e41 SHA-1: a59fc21b91089aebc2ab53118baf8cc6720b4dde SHA-256: b52a649c317462d447328b908b8e8ef6cae83a8260c6db7aab2f7d839cffa24f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The embedded URLs suggest an attempt to redirect users to external malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://tupnate.com/ckfinder/userfiles/files/magabixoretugor.pdf In PDF document text
    • http://civicwomen.com/ckfiles/files/21430032060.pdfIn PDF document text
    • https://dukupahit.com/contents/files/nifogamop.pdfIn PDF document text
    • http://mariancozma.com/_user/file/karutepifinizile.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/72605109100.pdfIn PDF document text
    • http://taociren.com/upload/file/210902031228308877fz7hmucknhvo.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/tekovikoxufafuxorilolu.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/noxobej.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/fdfa3f8f90d0534874c0c46b44e81ef4/tamukuxidadinefivakar.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/wovaxulijekegiwuveg.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/takenemugavetijapamusi.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/nofomarod.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/rubepirekujodetazaz.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/lerijabaretigefodapezoz.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613270703b705---ralupebumejigosoda.pdfIn PDF document text
    • https://oasis-travel.ro/files/94636831042.pdfIn PDF document text
    • https://invision.buzyhub.com/files/meterurafosopigelir.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161392b22e87b4---13823713132.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16131b83199aec---12881674743.pdfIn PDF document text
    • http://fruitvita.com/files/files/87447258837.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/68339393057.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/12894925.pdfIn PDF document text
    • http://hongdacable.com/d/files/jujijulufatigarajilumud.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/vonenisapesa.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/wobutakabakinobesurisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=turn+off+google+safe+search+androidPDF 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_off0000db23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB23 10720 bytes
SHA-256: 8e579d6c53b129d8cbcdd3966f99ffb1bf8f617c835c588e69326d9052f77ff4
font_01_sfnt_off0000f369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF369 17584 bytes
SHA-256: bf4b032e1362ae66171f0265f2b94c56e7bbd2c0d31169a476734182a497c0ec
font_02_sfnt_off00012064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12064 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1