Malicious PDF — malware analysis report

Static analysis result for SHA-256 1be1ddc51b6b73ec…

MALICIOUS

PDF

93.3 KB Created: 2021-06-28 12:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e4d88a47f40bfec6de508c1d6c39b56 SHA-1: f6dc5957b680176226386efe61c725d441282c36 SHA-256: 1be1ddc51b6b73ecc3b7440d66f0c524a77f9579d64c4b78f5478708ba3d68e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to external sites, many of which are hosted on compromised WordPress installations. The primary goal appears to be directing users to potentially malicious content or further phishing lures through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://electroagro.es/pub/files/68368703864.pdf
    • http://all4pets.cz/ckfinder/userfiles/files/wotunexuxaru.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/61d0f955be6fa5542331322565226623/37142781790.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/gut9i543dql81nseljifd96hb0/zomedezudakavugakikezof.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c535d676ee6---50359968545.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098326f75fe3---48061488205.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b6d0a2903---84121644100.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/b4a0bd6d5dec7fbd2839fc618be04246/36871655885.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c54f985bf---98386258344.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b993ebd9e4d---lajopowimevowiki.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3ee4960b0---48521950997.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fb043a934---55159101466.pdf
    • http://snap-drone.com/userfiles/file/rezuwovavebabezu.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/dtvsatbiqgats96knfa529lde6/talekegamelafuka.pdf
    • https://detectiveoffice.net/userfiles/file/tubafadutudegoru.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/7c7l5394fv01gbfpeldh2tpg8u/pavokatekijodakidabigavu.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/c823c66b11e79235f606359a2813cd44/nulezelivagelixagosiru.pdf
    • http://oldtimerclub-thueringerberg.at/images/file/34230488735.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fbb8bab88---gopiliwevawukajebuw.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/mfddd1i27vusate542pul234qo/dodimenito.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cb5c9bca13c---nujekanasujoximog.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad1768004f---tatugemerubiwalepikanovuz.pdf
    • http://bainihu.com/upfiles/editor/files/91287476367.pdf
    • http://busankid.com/webfiles/board/file///xabuterulimobonekeliriba.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5715f1cbce---59128948290.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=bedtime+stories+the+ugly+duckling
    • 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_off00010c94.bin
a034269531aa7c763dd92b6cda337ad400c1abf89c8595496580b12289c31892		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C94 11012 bytes
font_01_sfnt_off000125de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125DE 16792 bytes
font_02_sfnt_off00013df0.bin
7d0c71a341acf5a935c11036a410c4411316531cd2c42b4b48c4f86e0e90d2d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF0 16344 bytes

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