Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b001c984b8ad8b7…

MALICIOUS

PDF

78.1 KB Created: 2021-09-18 20:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0329241d071c8575cb36150be77282b6 SHA-1: 1babc3abaa39f31d7631f84e57e068bbc141ccec SHA-256: 0b001c984b8ad8b74d5bcc4ea3d3af1bc30405e256904a17270454baa3269a9e
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a deliberate attempt to create a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=minecraft+multiplayer+apk+download PDF link annotation
    • http://telegid.tv/userfiles/files/lazegupiperutovod.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/voxarowipudalaruxi.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/c9b15d197e196985cc042cec63647c27/wojatalujobutuwugomuz.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/57341719300.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/fezuxuz.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/mapavujunojive.pdfIn PDF document text
    • http://agro-norwa.pl/userfiles/file/budis.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/xafupifalejome.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/zebide.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/wunuwuzudotofakonomaj.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/58901784829.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/e382155f06b021ad0bc19e9813bcadf2/4880291515.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/xotozoxix.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/49955532114.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/65106740601.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/posoxotaxunutixuz.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/28471046492.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/tewajuzuxafakareke.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/lagulilanatilejunatoja.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/73c95cd6c1d21646c1eed55f4426569a/lifadubasu.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/14342870266.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387667a88b8---8572777209.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/6d816aec07616700bee8e36d194393ef/wanimemat.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/girefupidosuxewetapara.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_off0000c30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC30F 20400 bytes
SHA-256: 236d2928156f79be6485990651f04d2cfdc52da93085df53d7c1eebafa55c1dc
font_01_sfnt_off0000f8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F6 11000 bytes
SHA-256: 0af776b72031e2f10d370bc68b6ba808bde49698971a7229b21d62bcb39407c9
font_02_sfnt_off00011294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11294 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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