Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3616767d2a1e482…

MALICIOUS

PDF

84.7 KB Created: 2021-08-22 01:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1b1d940d4acb5a096a6f5fed86de5c8a SHA-1: 2eace6a7ea105aa71a86a938f8eaaa0ec34b0c86 SHA-256: e3616767d2a1e48217289aa4d06240c96c759edae29021704655f2ba00dfd45f
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 ML classifiers indicated a high probability of maliciousness. Numerous embedded URLs were found, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the detection results strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/idf6o6rm5ol8paj3kt9uelrmra/sapigowisisiwoz.pdf In PDF document text
    • https://ludifrance.fr/userfiles/file/lemamamavutun.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086828071cf7---newozitujakade.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/49274480814.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6046ec1f19---lamipebasa.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a6195a1f0---67963701523.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/64068165242.pdfIn PDF document text
    • https://anfauglir.com/images/file/leteri.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/21666448046.pdfIn PDF document text
    • http://crm333.com/documentos/file/64701916643.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a501f82c3b2---xivudasabibawanimenenati.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/sg5j7rk73cofpjj0nqmldkivh5/56216128541.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/68562894842.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/45759235786.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/dasizogerasaxuv.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/xetuwadaxodutezenusawi.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd6db1ee313---venovopukovivo.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/89665411306.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c020f352c46---pipoforuvadizi.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/719deq3j9l4qlfrmpae6csd5jl/xiwelaveb.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/sojulegozesijeluzefo.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a222022827---vupitarazenuvonomuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=r%C3%A9glage+injecteur+pompe+1.9+tdi+105PDF 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_off0000e0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BE 11660 bytes
SHA-256: cfa8a81393c6bac01bfa26c268963a680764c73568e669a559888a7603264007
font_02_sfnt_off000113fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FA 18364 bytes
SHA-256: 24f1b10fd13e14306f574a485256bc865b1793a084b2c7eac13e2dcd52b62954

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