Malicious PDF — malware analysis report

Static analysis result for SHA-256 72c6de654dec4d17…

MALICIOUS

PDF

84.3 KB Created: 2021-09-04 21:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: db3cd9bac119d5260a801ace9dcc08bb SHA-1: b79ddb9bf3a54ffe9a0d911407451fbdfc78485f SHA-256: 72c6de654dec4d174a6d049b4a098416bb7d9a15b46592dda94fd62d14f62d9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead the user away from the document, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://reklama-v-sochi.com/ckfinder/userfiles/files/zenarox.pdf In PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/nixenujibezobupepudagef.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/sawirebadoselafopope.pdfIn PDF document text
    • https://ivaco.it/file/67851239306.pdfIn PDF document text
    • http://agavietnam.com/img/files/2937041312.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fca6ccccdb---nedanenumi.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79064f1fa2---wewerijiwatafi.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2a6d34b3d---nodiwonolojal.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/11ab441f762aaa99724e53588cccf307/20349236025.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/vanuwip.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/37587954469.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606e52cd276fc---59172796432.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fbe9c3123---dozekurogisulisulize.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d938c1abdbc---vezeditabujafefat.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/suvetewawuzafikusa.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/98356456516.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/l75iqia23ie9ihq7cje6jbrfcn/31746455850.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/6dcaa7b6ed9d6fc1b08d12be0bc3a2a8/gobawudo.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/zokukagolurogalagaj.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607aad710d362---dikosisesuwijujox.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/vumofirabodusinotifemom.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/8f5ht62dg048b63ufpoao529p2/69826898942.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee61e3d1d6---jumomavapipetixufajabinaj.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/32251759403.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/19188367858.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7295a9303b---setoxojasaviboririzar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=national+bank+of+ethiopia+insurance+directives+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_off0000e3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A0 17440 bytes
SHA-256: 7efddf856fcd4cdef3561aeaac325c2268f6caf4c96deb02b2de4495575c28e5
font_01_sfnt_off000110d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D9 11092 bytes
SHA-256: 4b60d68e087f63fbfa52f6205427122d12ee730e919ef17e5a01e916dd632686
font_02_sfnt_off00012a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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