Malicious PDF — malware analysis report

Static analysis result for SHA-256 528834952a8fd149…

MALICIOUS

PDF

91.9 KB Created: 2021-06-27 18:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a7d837118c250164b8096315247bfb0 SHA-1: 0c66a8b2d4e46b6212a965a8040d3ce4fe6aeed3 SHA-256: 528834952a8fd149b23164e38dbc1836d7ae8b2e062b83280b70832eccbfa013
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites used for hosting files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the structure suggests a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/uo78nd1icoo32a06fvmgt3p926/nofar.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080572ac2e44---xafusovajusadulamala.pdf
    • http://manavpublicschool.org/manav/userfiles/file/77137145409.pdf
    • http://iehyun.com/editorupload/file/3709741700.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/g2o80nk7so84l433rocgaja9k1/vudedib.pdf
    • http://designklasse.de/ckfinder/userfiles/files/11714673880.pdf
    • https://gregor-biffiger.ch/userfiles/file/61216665411.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/85b0703d06bca6ed352ae07d9574c951/fasutisodafufiduroxariwem.pdf
    • https://thehideawayresortpattaya.com/userfiles/files/jebatag.pdf
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/4sbr05ofunhvr0cvadmhfh4dq4/42303104573.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/jolnmma5n7uc30c6hrjgd5crp4/vodezaxu.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/546c24f607ba01f760dd5bde09506ca9/76347254079.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160ab69aabcea5---kosisof.pdf
    • https://nabsangram.com/userfiles/file/43144174457.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd340d541e---piletirug.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca9599e821---fabofuporasa.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072e3937d0dd---tewub.pdf
    • http://abwgulfport.com/uploads/files/56290920192.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/2658f788a6472ab76c83227d0150b6e6/76774896867.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2bbfac217---fivetegiwakewuberavuzasin.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcff565149---vetavugejadotudugifanup.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dfd8413e7a---xodotosigumalibaseg.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/a081fd6452636f2b713068d5a7172ac3/sikam.pdf
    • http://studiodrago.eu/userfiles/files/81196573724.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a54da8f341c---vitiguniri.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f7c9053cd---fodusamigozivafitorid.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=face+drawing+easy
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdf154db4d---xulojunumerafifop.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010784.bin
ebfa5dde109db08030bdb0fe78c2c02b363efde376cc847c9c33fe067bc9bd18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10784 16576 bytes
font_01_sfnt_off00013295.bin
fa82558fbac9bfb87eb7dc3bcecb51b4f70d704ae331da6aee8b1f2b02677cb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13295 10460 bytes
font_02_sfnt_off00014a42.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A42 16792 bytes

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