Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd1b89c5bd5659f9…

MALICIOUS

PDF

106.7 KB Created: 2021-08-06 11:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ba53814bd210e874887fb04c2746a601 SHA-1: 60443da49335c0de1c6fc22e1f799b0c033284a2 SHA-256: cd1b89c5bd5659f98ed74f4f4a689d9441825847b1b7fbb220e24c11c5908df8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm. Heuristics indicate these links are hosted on disposable or potentially compromised CMS upload storage, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9852

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://mastera-mix.ru/ckfinder/userfiles/files/33522171094.pdf In PDF document text
    • https://dolaodong.com/userfiles/file/zozula.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb1d044d161---17124944490.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a6c4c637a---23499416993.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/qjfsn6qiei5to1fnua9lb3jt7b/kitabedujadibulejinodom.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/65504773429.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/32731043460a4232684575.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/bosebigufupoletokivan.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/sanowuku.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5c5ece00c---47078946063.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/87622905122.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/laforukapipozosibitaje.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/2k942qts2e8m088me9esor289e/8549939466.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/75542631184.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/71546633156.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a79d7830562---dazisinabigomixerabemaroz.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103d9fa95c82---tegixo.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/nujavivopikutoka.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/0268636aa56ea355515d349ca89b51fa/49752979877.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/barufuxerewuripejiwaridiw.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/c780e8d0feaff164491c1cc106a0bf8a/piboxozogurisotor.pdfIn PDF document text
    • https://landi-bg.com/images/file/nuworetox.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/7ede36258d4c1e94598dcdd56579cda5/56756480442.pdfIn PDF document text
    • https://activepymes.com/pub/file/farigobojepifi.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/10752201736.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/86473234374.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/49483153115.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=el+moasser+guide+answer+math+prep+3PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001079c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1079C 30068 bytes
SHA-256: 09dea450c5a4d99d0e7abb70fdcb30d2050d4b9f172f48a83164c2355ab4474f
font_01_sfnt_off00013d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D31 16276 bytes
SHA-256: 5224690fbcc0294095f04d726a8ec8cc0ffb673ca434bec37b2b07329544c7fb
font_02_sfnt_off00016781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16781 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F98 11180 bytes
SHA-256: bfa8d163c88e2265c682730f9c8a7519cd0c0c4574fe5b1f2a19db5e0543a0cc

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