Malicious PDF — malware analysis report

Static analysis result for SHA-256 187d7d5024bf8178…

MALICIOUS

PDF

80.9 KB Created: 2021-09-07 23:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1f464dbfbeab404e18c557194e903bb8 SHA-1: d96132ff4da2969b3aa0933196adce0060ef9615 SHA-256: 187d7d5024bf81788dd45dde3cfb435237b9f598a6c195a1aa5dc85dd56958da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The presence of PDF link farm techniques and ML classification further supports its malicious nature.

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 https://cfi-registration.org/buzzboxgift/img/userfiles/files/bofukinasevisamegalakek.pdf In PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daafb753c90---ligevibenovuten.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/o5fdh6n3gusqtk6jt6ag1n09mu/bukipogevuxevisibaxidol.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/wegubenuzodofobaze.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/451ff2b005a502f222febbbdc37ea918/20083979033.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6d35eef03---vevanor.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/doverobadosurale.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/kiwewowidaxuwodidopox.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/41970291961.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3013c335fc---vuxom.pdfIn PDF document text
    • http://samwha.com/upload/userfiles/file/4632305330.pdfIn PDF document text
    • https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images//files/41086107661.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8ff4506025---sitefewoxawupexase.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/pobag.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/18878467617.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/5667574150.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c22c60166b1---kedepisajusasuli.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a16bc8147---refiwirapapusuw.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/zifozozokedela.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e515986a17---58013767813.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ffb274c471d---gokiluwezixip.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/54153558007.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/nokavolak.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/vawipilatinunu.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/narazox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=double+door+design+catalogue+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_off0000d892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD892 11036 bytes
SHA-256: 15a2c4898fb0e7ff22784a19c589ce64d78aba242646689db1988727780a4d11
font_01_sfnt_off0000f1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FB 17184 bytes
SHA-256: f1eb51ff5386823dc3f8409da60495bb61b082da32cb085a582ca13b7ed91894

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