Malicious PDF — malware analysis report

Static analysis result for SHA-256 a84e23ef75a194cf…

MALICIOUS

PDF

84.3 KB Created: 2021-09-01 10:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6c135872e7500d69b69133bbc605273b SHA-1: 275983277fd47116a7078603598566a8afb8d169 SHA-256: a84e23ef75a194cf33130ca9b796137fa6b47250612f17bb4d719ef3ad578f40
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting, indicating a phishing or malicious content distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://krisoc.ru/uplcv?utm_term=area+of+part+of+a+circle+formula PDF link annotation
    • http://geometramaurotozzi.it/userfiles/files/85725834309.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/tunenowezijupotaxamura.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/98551400448.pdfIn PDF document text
    • http://idroter.org/userfiles/files/komuveguzorara.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfac334e988---danunezojatuz.pdfIn PDF document text
    • http://goldmustang.com/files/files/15923628794.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/sitigalisamisimil.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084cac70460d---8826430852.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/77457143621.pdfIn PDF document text
    • http://ipceurope.com/assets/file/21552744660.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/5858c8fd6d4fbbe8f629881cd7b49d84/suwitofapiliratatorisalud.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/ivp7vfvade7gbffa5pfgees8bj/bikun.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/79eb0a522055a3dd097ab8a99555a130/mesurugedeserunu.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/jamafular.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/zatesolulifazegevodon.pdfIn PDF document text
    • https://summit-christian-academy.com/scauserfiles/files/75710658056.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610bc7a348180---43523798792.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/752cee5c761e870e3986b79b2312c31e/fenoripefolexafope.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/fatoduker.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/bfa0eb18bd2ec9a3a213f17ab5f5bfc5/xinegugafutot.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210620021632_x67jtg.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/83529073231.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/vifagipiwoladiwaripiko.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/9fe50423d61e24e49fec43359f830ba4/95600005881.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/zawik.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/zanijeka.pdfIn PDF document text
    • 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_off0000e14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14E 19352 bytes
SHA-256: a8a2bfb46839f2dd4324f7588ebd7706fc3f7f89f194e5a74f346d5956b40a25
font_01_sfnt_off00011330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11330 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B47 10448 bytes
SHA-256: c2f34d21651d5be1f69eb1e05fed15466cedb84fa9fd0fa429e8674a162e8c4d

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