Malicious PDF — malware analysis report

Static analysis result for SHA-256 e55dcbbe131082b5…

MALICIOUS

PDF

88.3 KB Created: 2021-08-05 01:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f4b175ea98ff9ace7dfed8349ab3065b SHA-1: 0571240a40fa1112a7546376cbe7eafb3bd7e4a5 SHA-256: e55dcbbe131082b57a9092a7f573a24349212f6a413c0c1fd98e19cb6a9d45e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm directing users to numerous external URLs, with several hosted on compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://harom.ro/files/file/59648304759.pdf In PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f589c204a---95527557154.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/damen.pdfIn PDF document text
    • http://erictex.com/ufiles/files/53118576392.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/pcs1o02k8opa9aivn56lir8f19/lujetozata.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/gnnfmpaaj19vpehbrem7j4da46/71213978136.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/84631648716.pdfIn PDF document text
    • http://jsdarvin.com/files/kituwijevividusa.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/97c280454565e5e8baed21a912cdad02/datuwovabetodini.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/0moabf9j1va2oc8hhrpmucf679/36481592053.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608185ca4a67c---387596271.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/32128842779.pdfIn PDF document text
    • http://abpaluso.com/upload/file/83328064534.pdfIn PDF document text
    • http://gibisch.com/files/files/pixewigiju.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16106b2e8573ac---97911218926.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/78425818900.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/27bba0688f9dfbc0026a35795da08f2a/78813351025.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1903c99465---bupokavirezuzuseku.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c308db8f97c---51372978363.pdfIn PDF document text
    • https://lavineriablend.it/file/mijizusuva.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a88a84a0fc---rolozeve.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/viwitawebezodalunifomon.pdfIn PDF document text
    • http://premium-h.info/files/files/67888832271.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/95059391401.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/80200947639.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/5e56c1b94fda7a5996db586e91e9092b/dumaguxudatajokenu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+learn+python+the+hard+wayPDF 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_off0000f69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69A 17312 bytes
SHA-256: bd4fb6b222df154238e9662fa15cedc06ebe6897fd80ba025d56289508e82589
font_01_sfnt_off000123fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C12 10420 bytes
SHA-256: 4cbd1d8ee9f0a01e42443b993e40e5491c1ae4d2d2a6da86267eeb6077a69ac1

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