Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a8e993b7c625c0…

MALICIOUS

PDF

86.0 KB Created: 2021-09-09 12:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1023185de6055f2af40333a03c9f6275 SHA-1: 5f7a2c20cc36583a42254912000ffa5df820018d SHA-256: b5a8e993b7c625c0fee2119ac36e10a6e7b21c48123fe631cc164f199c4f4771
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, aiming to trick users into downloading software. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the presence of numerous links to potentially malicious PDFs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ajivikafinance.com/userfiles/file/96237171231.pdf In PDF document text
    • https://ukmalayalamnews.com/userfiles/file/8357401601.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/81887137546.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161339a1ae93cc---7456960830.pdfIn PDF document text
    • http://fedime.org/imagenes/rogipirilurumalowedo.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/zenedoleludixopaf.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210905_092531.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/pixozolisorefetej.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/35081114669.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/46645640956.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/povigijiwujininuzo.pdfIn PDF document text
    • http://sudeoksa.org/userfiles/file/20210908075816.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/21924082342.pdfIn PDF document text
    • http://pokrowce-ochronne.pl/Upload/file/68766181041.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210906125232_Z29kaWdlcGFwYW5vbmlnYXRpYg==.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e13c5d4e9---71908859469.pdfIn PDF document text
    • http://skisun.it/userfiles/files/84152924642.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/fikajapesaboveveviviv.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/22304115052.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/jumofal.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161375a428c6b6---jufeximopawewetufawe.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/46751991465.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/67145983252.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/mubitorobisurol.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4af6107c28ec51b6d67bdeeefe45bb61/25316197163.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=popcorn+time+app+free+downloadPDF 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_off0000e98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001019d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019D 18416 bytes
SHA-256: 133ced059a07c299871f69a6f78b88f69403cdce013c94c6c5cde32d2181e554
font_02_sfnt_off00013186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13186 10700 bytes
SHA-256: c69612cf91c7425aa96079ab986e83986ce71640447fb28ba8a053cbf503a0cd