Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef2c0312d45fe721…

MALICIOUS

PDF

87.6 KB Created: 2021-06-29 22:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e80d0b566cc5bd319451f0307abba5ac SHA-1: 654f1d6daeab2d44e0f62b924aea174293765f64 SHA-256: ef2c0312d45fe7212ab6321f34cf5ac5aa9a1c55bff4552e382b7694569dd9e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bd5620e62---pilatemomuretomamelu.pdf In PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c5557e13f89---ragazegamajuziginubono.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/ee41f59bd138f38e201863d34f795949/pajelejerokudijoz.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075abd9eb41e---78017291173.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/dmee9tdrig95nka1ctqfhobpth/86554747497.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf6e10de28---voririvoga.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607de871da2d2---65881535612.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/394b959f9f61f090120b7527ae431b23/kadizoruxukikuduxegixo.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/93bc074a4126291a7c908d485278848c/xivuzazapabelosevodolivi.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/gomanupujurane.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/44293903246.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b12aa93fb08---32069180446.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/fc44bef4b72ae256a7416a22610d7ce3/warizu.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/59721436193.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/bosezokikusu.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/040991f1183aa8468a457e1488c9556e/sijeza.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/lamup.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/7214519540.pdfIn PDF document text
    • https://ilmercatinosottocasa.com/file/duwewamogomef.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609232ef8b628---ritono.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/6ee046c7277a29b01764bd5957521872/77704855356.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad77ae69e82---52541003454.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/57257459391.pdfIn PDF document text
    • http://www.ipkameralari24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac656d1efa7---kakagixizafimizexiba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+get+free+robux+in+a+minutePDF 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_off0000f04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10861 10760 bytes
SHA-256: 8d9cbb28176600837eb2d937b3b36c5d69df9afadb8ba3e7a8eaf014cc1537bc
font_02_sfnt_off0001212c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212C 18084 bytes
SHA-256: da5ab9beac7b78b6a33a347d21b36a2b29c4154b8b30cb0d06eba86497843610

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