Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d27ac0c90f7945…

MALICIOUS

PDF

91.3 KB Created: 2021-07-01 19:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d88007279da2944f06b2dd09d3670e33 SHA-1: c858fe5cf6a171fc4f77b01cc5fabb3a67e53643 SHA-256: c9d27ac0c90f7945306b52d2f7c9dabca75a6b0486d71c08db3350bdbe01c10b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites and IP addresses, indicating an attempt to redirect the user to a malicious resource. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a primary mechanism for executing malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://broadviewlibrary.org/uploaded_bvlib/file/tijobudisasijode.pdf In PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/tgmfpcm1su9aiejusv3dv9961p/dotesoxepipotatazub.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a2775c972de---77782641746.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce841bd093b---mizuribase.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/luaga2s7q8e29vktcrbjqoetdu/gazakuxaxamawa.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/f8ef8c96dd3d0345a39ea183220fb962/lejizupar.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/260655225149.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/69202189890.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160978acf6b2d7---22457081223.pdfPDF link annotation
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/617tu68g3hjs7gvbs601drbv10/fedakakubateropomopapisi.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/88219b73290eb6d7021a6a9d0a066492/28893484673.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4c4bc5093fd9deaf76d48106acb40170/64203464511.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc4f5efff4---xiligo.pdfIn PDF document text
    • https://goodline.by/userfiles/file/36294670456.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/lafekajubus.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/34392349ae2ded8fd0c4c76858f1f943/puzepivitapejuwoli.pdfIn PDF document text
    • https://proxus.nl/file/55973715231.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0655da6d6b---97646557755.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/36086115522.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/e7m6gm88t35i9qqfulduf8qb8b/95602148892.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bc9a79913---dararilotogedosedirosuvil.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/15957396940.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/6ba084ebe7799c62deda9d6a18b87bd3/87437987759.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606effea2bc3c---suziwowijuzepojidipada.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/lotunawabasoduxew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=golf+card+game+pointsPDF 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_off000103bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BB 11004 bytes
SHA-256: 4a9e5333017d64d8878c907a7770d9ac38dd998d6d06e6fe8161b272d6f4fac3
font_01_sfnt_off00011d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001352d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1352D 16492 bytes
SHA-256: 9cc5c956e554f18eb333957b25dca0063cd68aed61d3c8cb208a3c4a06cac147

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