Malicious PDF — malware analysis report

Static analysis result for SHA-256 d987413c816c755a…

MALICIOUS

PDF

92.8 KB Created: 2021-09-01 03:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d5af0fa47afa49e77a8379de4c00ac0d SHA-1: f9db7d7cd7ad66fc7194ed5011a5bae0c5b53fbb SHA-256: d987413c816c755aab0bd2e32a1188444e71a6dc75bd324bce25bcb7bbc02b72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609feadb2f5ab---86362332712.pdf In PDF document text
    • http://uekekb.ru/!upload/files/91763915229.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/ddea11185821fa1569a500856447a819/16291737766.pdfIn PDF document text
    • http://elijahlaurabishopblack.com/clients/b/be/bed082b287f5bb70db4763ab929fc18a/File/lexapazepopum.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/91322898995.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/84788701545.pdfIn PDF document text
    • http://sns.hu/_user/file/32489557310.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/gomefiruvilobagipinufe.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/polotimubipoxojitilajage.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/luvubumagot.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/98830405132.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/78010406d7f728cac3f49b8a04b4fb5d/papurapuvonedurumaje.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/6f986ba12b18884cc9a4400dfa7dd80c/98313535455.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/5460448410.pdfIn PDF document text
    • http://babamoleskine.com/files/file/84598290211.pdfIn PDF document text
    • https://mimpiindah88.com/contents//files/71753274683.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac54cbab257---wasojewaditusulivuzakeriw.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210529010630.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fbdfa375890---37333649469.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/sosirasufedezajuwomebuka.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16103c07b4d99c---5435393024.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/jl0l6d1p8c0511ip2in7852s7d/49045575154.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/oit57itvfeqkf5sgrol7tfl65tag0sr9/pobazopujagip.pdfIn PDF document text
    • http://18554080.com/userfiles/file/18501884399.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=safety+equipment+survey+solasPDF 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_off000106c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C8 17316 bytes
SHA-256: 67a2044d962cad09fbaa2795b82e93bec2ea5ec63c256bb4a4a4059d5eb3abf3
font_01_sfnt_off0001333b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1333B 11020 bytes
SHA-256: cd2b7be4879bfa54f538743f1fe9be9bac9c84415ae8ce5102a58c13ee239e8b
font_02_sfnt_off00014cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1