Malicious PDF — malware analysis report

Static analysis result for SHA-256 53631cd51bd41ddb…

MALICIOUS

PDF

95.3 KB Created: 2021-08-14 22:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c24c119530318da77d2c761ff558da98 SHA-1: bcbafc70360561bd7924c2d13f43ded75725afb0 SHA-256: 53631cd51bd41ddb91949e56585b87d254110fd6ec2731965194382fd6d815ad
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to host or distribute malicious files. The presence of a 'download button' heuristic further supports the lure-based attack pattern. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ac67bd2b5---silomazemajobot.pdf In PDF document text
    • http://agisma.ru/files/pages/files/pogonevofakevavuzelobewe.pdfIn PDF document text
    • http://veribase.com/E/file/62976667132.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080864016b64---kemidetamugidewotexuvet.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/gerapobaga.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/f0857a6918d8e21af1fdb433e3beeb3b/zimutev.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/33a9effe5c0daa3f1561411bc2fb078c/pebiwilefuto.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/b70cddaf61c90a311a687f938c8d3be3/dekarera.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa44a353ad8---91825387045.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b2a6947e1---xunokigofagutogumilaruj.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ba755f25ce8---38140299754.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/f4bd291993671f92e9c0fc20fdb0fc5b/sasebamixuxavatoz.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/13b93q4u6a636k7o179sfdtk16/fiwukeg.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/sepuwitexe.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/68701633989.pdfIn PDF document text
    • http://didula.com/img/file/tamegaxonepoxumiruzef.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95048561984.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d4a1cb019---38497934721.pdfIn PDF document text
    • https://clinic4lab.com/upload/ckfinder_temp/files/20210702160827.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/nizebokitexeb.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bae8dd877f1---81418168976.pdfIn PDF document text
    • http://euroialinsol.ro/userfiles/file/31119616456.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2c830c5b8---jonozo.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/97948391656.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcf475d400---44482353685.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/pewezatepilibozopejaliv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=download+gta+4+for+android+apk+%2B+data+highly+compressed+10mbPDF 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_off00010c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C24 11752 bytes
SHA-256: 69f6c4545c395ab3e93fce4cda8c4364ee6582754525ba6e702600a9dcb5b6f9
font_01_sfnt_off000127bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BD 17488 bytes
SHA-256: fbf2516522a79acdaeee4cb1d04c54a2c40246d1f6cbb96e36929970487bc8ea
font_02_sfnt_off00015562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15562 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.