Malicious PDF — malware analysis report

Static analysis result for SHA-256 b131be4de1d541f7…

MALICIOUS

PDF

93.5 KB Created: 2021-07-13 10:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a56510dd56de896a3e3b591942d7bc4b SHA-1: ebb8780185ec701d9a0eaeb6d76404873f0d8817 SHA-256: b131be4de1d541f708f002dd4de61286988fb815246b3c14d664e390309b5417
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised CMS upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/cabdc60289ef431ab642bd63776abd3a/kupefoja.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607be929c16bf---memopuf.pdf
    • http://barudan.hk/UploadFile/file/20210616094625844.pdf
    • http://mp-journal.com/media/file/pezavagabolep.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607b029f91a2e---98890761537.pdf
    • http://tangiahoang.com/skinkorea/Images_upload/files/sijunejujaboluxulezu.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/5a016e807440d6504214d06c84a956a8/33039489150.pdf
    • http://twothirdsmajority.us/clients/38522/File/goxive.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ead68b0e46---wemigudosod.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae55c2d9766---11461579084.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160917d55b2955---dimijujixeradesoguzerubo.pdf
    • https://hizlipin.com/calisma2/files/uploads/75232741565.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/tlbndgkb4qv8hjekoiq39olk5h/gozajoderixagidudig.pdf
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/ferisuxujixaw.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1a1a95da2---zipiti.pdf
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zajudajusovi.pdf
    • http://www.heksan.com.pl/file/75500674644.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c88a828cf---37721767458.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/1b01b742a2b4f0a37b3abd94ad180cd3/femazatiwuwelogesafe.pdf
    • http://www.uniformsolutionsforyou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d84a5bb1ff---ruwajif.pdf
    • http://goref.ru/files/file/mixanolimesemefefofadebe.pdf
    • https://susta.vn/userfiles/file/ramakemasozesiw.pdf
    • http://charlotteellisscholarship.com/clients/a/a5/a56794a54ce3a7e2a8fdc514f00cf952/File/vulenuletejexa.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/7b3a881e4ff76dd10c716a1700c4cd40/99056775937.pdf
    • http://fotofolliasanlazzaro.it/userfiles/files/53848924341.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/d0406ef3cc93914b68771d5074335123/68130846577.pdf
    • http://www.findvoters.com/userfiles/file/77653818947.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+cranberries+unplugged
    • 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_off00010713.bin
e60c909cfff33d5f2ec8b7c98fb6fba7be966ffb5cc15b7e3930cdd47a9536be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10713 19628 bytes
font_01_sfnt_off00013830.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13830 16792 bytes
font_02_sfnt_off00015047.bin
1db161c45e210f4af0f8818f57a3986822ae095b4f36fb19d467cc153c43eaea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15047 10776 bytes

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