Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aec3c2d22788afa…

MALICIOUS

PDF

119.4 KB Created: 2021-06-27 00:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5082db439a0d673608ade123d7ef5912 SHA-1: e1b89ef82511cbd013b750bb5f787acffd417516 SHA-256: 9aec3c2d22788afa731174dc993a525ba827b01edddcad83eb8b3fd4bd12cd7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the Formcraft plugin for file uploads. This suggests a phishing or redirection campaign, where the PDF serves as a lure to direct users to external, potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a8497cd257d---wixuzudazerume.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc848787ce---55804097940.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b567601aeb9---10229794211.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160beb93d56d47---82899753861.pdf
    • https://eltonltd.ru/sites/default/files/uploads/84908596194.pdf
    • http://netinflux.net/userfiles/file/30194800110.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/10f48114e835416ecab1558cc0009fe9/2107915759.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/6b81b0fec3993d5de161a6fa2eed4729/47075305065.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/0876111327dcbb38dce4b90804d798c1/xeriwuwi.pdf
    • http://trungnguyenjsc.vn/uploads/image/files/lunubalitodul.pdf
    • http://hongshengfish.com/uploadfiles/2021062405101617415.pdf
    • http://martonaroniskola.net/userfiles/file/kudewejitaloriguxexazimo.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/377d804480793a49c43961a55eaa6d7f/sadejelogorowojizifev.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/321067e6265c8609a593263ae022ab63/94038922898.pdf
    • http://lube-stc.com/ckfinder/userfiles/files/logaw.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/3487bce1d646f7f8a8ff8a569d8809bf/gureripijijosakovub.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad8b60946b---34110418046.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a567abd8859---sinopurodoxudikuze.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609853ec83017---velokapigonizovitekasof.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/b0cd04e17ef15b1a860cd7599d89c1f2/39291485328.pdf
    • https://airbays.com/userfiles/file/6586961858.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/jqr2nhbbok35rrpq9ml9lgm9g5/46776309102.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/89a66r70ic4e65e73f8il1rbfv/ruteruwixabifolugogajeza.pdf
    • http://all-pass.com/folder/editor/file/33835870320.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/14c31ff4aa155614818ef2a9f7f5fdd7/zutasopiv.pdf
    • https://gea99.com/ckfinder/userfiles/files/97267837239.pdf
    • http://alemotta.com/resources/original/file/totiwewo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=chix+and+wings
    • 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_off000171f4.bin
1759394ee0b8ab509fcda0c01611164ba9f4895d4fdf8f38feecfc66829b0953		 pdf-font-stream PDF embedded font (sfnt) at offset 0x171F4 18720 bytes
font_01_sfnt_off0001a1a1.bin
6f963294751888d8710d95f84d8470268afcf7f0558f399e9647b640cb9be8d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1A1 10252 bytes
font_02_sfnt_off0001b86f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B86F 16792 bytes

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