Malicious PDF — malware analysis report

Static analysis result for SHA-256 1de723119fed71f2…

MALICIOUS

PDF

88.7 KB Created: 2021-06-30 19:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3946fcd0741247780e3a65ee17070929 SHA-1: 86c345e92d5b8c20f803f5eeacab86c498a426cd SHA-256: 1de723119fed71f22c90f95f05f745d24d7a4a3680e98b07fae0b5071db7cd19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to websites hosted on compromised WordPress upload storage, indicating a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the presence of link farms and compromised hosting is sufficient evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cnhhgj.com/upfiles/userfiles/file/juzavikomuzawolan.pdf In PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/989955dfec85a848b8f45de5c1b33d9d/ginaligedurefopesekekege.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/witij.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/8657942839.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094dfe27e026---webat.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca302bbd86---67595666617.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/57286534876.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/5alhhdl4e2sijouet1o08pj382/43825279266.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a52b3a34c10---67842293921.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/264cf67b602a391d9bb06d357e557451/tisezebozuwanuduse.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/67339083268.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/801a13c0dda2eea8b8241859eda45a67/fokorogivemuwob.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/2p8263mgbjv09ui7lvq2ev9rnv/76376150654.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/pthhdpq8eqm6hfvnl6tpiivefq/javodiveporusotesoge.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/xevonumijikipejodiv.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/revukimido.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/mexetezox.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/6faefebf53d3fdcce513ee5175388ce1/wusefadepafafuri.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/fk581a80rhug3hprgd2b870hj5/1697347407.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/6fe0c2a375575d8ae84674030b4e0056/65906137703.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/zigosi.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/j9r0r4rernb734vi4ej7mfajpq/jivutagozofiri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=36+h+breastsPDF 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_off0000f9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F9 17268 bytes
SHA-256: fcc7481abdb9e71ee06cf2069251e32e988785bbe426649e3781fc85821d3291
font_01_sfnt_off000126e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E5 10224 bytes
SHA-256: f799d1d4dc487cea13a418f43e96fa4c2c586316e80c981d987c9a796a5435ae
font_02_sfnt_off00013e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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