Malicious PDF — malware analysis report

Static analysis result for SHA-256 f328a97dd8a85702…

MALICIOUS

PDF

77.1 KB Created: 2021-07-15 09:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a21a43b1b44bc60c8e5b2a1faa3a533e SHA-1: d416ae13597c6718fac74a98e65ad3d5d9377a9f SHA-256: f328a97dd8a857028e154e51995ce84ee727d700244ebb202fc9d6d2a0460533
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites. The PDF's structure and embedded URLs suggest it is designed to facilitate phishing or malware distribution by leading users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/kftdi6nsk27oipmgql79195jah/22653790398.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160994ff36cb61---39622477813.pdf
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/a44a3d68973e2ba1cf74e497e1fd64d2/3470191460.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/dn7vugf64nr76bl4dc0f7t283j/wazurawilewutum.pdf
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/76776519453.pdf
    • http://alexanderkanevskyartgallery.com/clientMedia/file/37876823446.pdf
    • https://nhatngudongkinh.com/upload/ckupload/files/regupufat.pdf
    • https://fzclicks.com/demo/files/editor/file/werabonu.pdf
    • http://auto-spec.ca/fck/file/24608069525.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/d9602452f8e10271ad71e69cabc35289/22955777879.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/bj88jpgj6q78ts3k492b2sg5em/jovobediwavunora.pdf
    • http://vendsol.com/userfiles/file/juson.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/3cefde447141daaed9ae21e84fd5eaa8/6146371342.pdf
    • http://aapltd.net/userfiles/file/36775523320.pdf
    • http://cnc-soustruzeni.cz/files/file/pulitujidoru.pdf
    • http://studiocommercialedelpiano.it/userfiles/files/xulebisagituzu.pdf
    • https://mundolibre.cl/uploads/userfiles/files/fivomivoson.pdf
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/35289969005.pdf
    • https://eletvital.hu/uploads/files/71317543533.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16088a5f353363---banuweleloboroxomafeximab.pdf
    • http://c2r-auto.com/uploadfiles/file/2021052110562373499.pdf
    • http://motorlustor.net/userfiles/file/4168814027.pdf
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210613144841.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e279b10de2a---75321217915.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=determine+the+x+and+y+coordinates+of+the+centroid+of+the+shaded+area+chegg
    • 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_off0000c72a.bin
02f8906f29c9f856d814b9d1a72685025355ae6685f07f7da5e7f8dd451cb9b4
pdf-font-stream PDF embedded font (sfnt) at offset 0xC72A 11092 bytes
font_01_sfnt_off0000e0b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B5 16792 bytes
font_02_sfnt_off0000f8c7.bin
684a26dcc6728c8dc7afdbe668ff37bbde3958b0ae0357157821d8a8dcfbd0cd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C7 17276 bytes