Malicious PDF — malware analysis report

Static analysis result for SHA-256 72d584f718ac2777…

MALICIOUS

PDF

86.6 KB Created: 2021-08-19 21:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8e939431d10d8a14238940c5117d9323 SHA-1: bbbf3f86a7f788f7306a586c6f6f7bc1e423e75f SHA-256: 72d584f718ac27777453932b2186579c7c8663f3acee58e22034116b019b4c9b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to numerous URLs hosted on compromised websites, likely intended to redirect users to malicious content. The presence of embedded URLs and the nature of the link farm suggest an attempt to lure users into clicking through to a phishing site or downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://vicorsupply.com/uploads/images//files/85641650069.pdf In PDF document text
    • http://mrybalko.ru/files/20313197920.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/86231162620.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/7553343201.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f87884a4e---74961091349.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16088785808172---ditudalisupenumaxuloma.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/xedirivotudix.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/191052d34972163ea6058e8b4292a43d/61992727610.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/96eb955ba24898871c6fb93251a90dfc/fisavunavun.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c830759493---nusij.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/32131353184.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/0bca2c417ec2402377398ff3f29d21b8/mekaperevuzinijapuw.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160986357ee3cd---letilagasixixome.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/76926323504.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/8ufvml6l847eqnchurbs2f9d5b/jisilijikoz.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/jirarekasunivamaxogukiwar.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afba7734967---lomegisepuvula.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/90496014640.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d42aaaca1---lubofas.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/f37670f458d544d230ceb498e9986641/lofegegelokusijisurabijot.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/gokovegaw.pdfIn PDF document text
    • https://s-h.cc/uploads//files/202108061618069611.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/so7amj8fkaegfqanpfi6c98uuo/62052548720.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9376a271a---41481551681.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/83261516305.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=10+ejemplos+de+palabras+agudas+graves+esdr%C3%BAjulas+y+sobreesdr%C3%BAjulasPDF link annotation
    • 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_off0000e9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C1 11184 bytes
SHA-256: e7ee6d9f1e069d21c9563f05f37c79fbf8999585bdd2d3eb5ae2cdbe04b9b888
font_01_sfnt_off0001034d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034D 17752 bytes
SHA-256: cd287660f206d61771421ac859da596e9c9d883d7a49a4561b661ab74bcd7db0
font_02_sfnt_off00012ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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