Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1744cc79bb5016c…

MALICIOUS

PDF

89.2 KB Created: 2021-06-26 15:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a346909484b7281307443b46c744e2f7 SHA-1: ca0522a099e05824eb1f380a08d534814f7b40a2 SHA-256: e1744cc79bb5016c2cd358c857edad283729f063c68caaf3ae99b052fea017a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, many of which host PDFs that appear to be part of a link farm. One URL, 'https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+unprotect+pdf+document', suggests a phishing lure related to unlocking PDF documents. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606cb3f5541dd---rorozotejorosajadipasota.pdf In PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/f7c7d77d849592c2dba1c39016747c11/76964073555.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988a5bb2df7---faligojukafutizaniva.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160842f98d324d---dagararuxidoguto.pdfIn PDF document text
    • https://tepihtrava.rs//files/5892032021.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/b086ddbc33ab67ef3427bae1f029bfdc/30748536378.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/06e51e6c5e9f43c28a3bf62279e19a83/38092284800.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/29a424fb9ca17508e78ba14887de509b/zimuxatusulevipupewafapal.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/69686403838.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a800c898c9---19279642554.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/332f74999f7bbeb4453f13328bb4ea81/zujovezukedikiduf.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/74733991173.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f5994dded---74808551646.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba59bd6479f---88147588245.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/d0a344ccb8029e162c08506d69aca630/milekebejinunudaribawaj.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/97f79c77922e63a4bd3b83d608694aef/kujemimupawojesidol.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b067071bf80---19101422004.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160914ca92e075---54582220291.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/runetikuzogosora.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/2839625871.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/revopagibawuxodag.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c48fad6ccb4---92052371321.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/radavofalo.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/39378945745.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070cb0c8b7d4---tukogagu.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c42adc37e---20792963352.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3aa1111908---88799439921.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3250680167---puzefumupepul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+unprotect+pdf+documentPDF 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_off0000fa50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA50 10488 bytes
SHA-256: c8b73e6f7c36036ed5188a782a952d832c51fc59bfc7c42f90b442af4cb7436f
font_01_sfnt_off00011225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11225 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A37 17280 bytes
SHA-256: 8a50a8752b4ca558dcffd9ee72a3d7d5028e770346c9e8de4bc2999bf446ccfc

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