Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ced9d1ffef119c…

MALICIOUS

PDF

87.7 KB Created: 2021-06-28 23:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 44bb346ad72ed325505cdbae2d879fd0 SHA-1: 2ddfc76cacc4b9019d5a3b5aba011a1d632115c4 SHA-256: 51ced9d1ffef119c34cd494203355707f915151a6b45b59733a931096cb3e516
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised or disposable domains, suggesting it's used to redirect users to malicious sites. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/kivexitutuzudojigeno.pdf In PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b16b5a679aa---21308609292.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/genegajirotodemug.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/11072415147.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/keposotixe.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/6bb327f3a43ed5113bb085a3683c31f3/48575991964.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5851a2e965---32055978598.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///99566792686.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/43h5b1v8qs7bo0v4aadqbus4qm/wilofoxaminum.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8b2c42800f---15356325175.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607d028f36968---sonajoroba.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160815e8ae0d6b---99152410075.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/wiwedevobusinijito.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/49339897119.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607547fe90292---20453951346.pdfIn PDF document text
    • https://dpmceramiche.it/file/pubugefifujofirevupuf.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/07ih59u06eun5tu64r1gvfok26/fuxusa.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/19187121597.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c55cc39bc---japadibasabijaguradu.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/bozuses.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210614080830_16oxfy.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/paki9ae0ahegg1u0u1u9lqn2s0/rifikifomigijilinetofozup.pdfIn PDF document text
    • http://helpibr.org/clients/f/fe/feaff840d005acecac0f151e8679c8db/File/30871863995.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a328b120faf---lubobubalofodenu.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/29317fe10d10df1bc6200a5da7f7a7d9/47885153169.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=snaptube+mp3+and+video+downloaderPDF 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_off0000f327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF327 16584 bytes
SHA-256: b6a5d50b3469affce9ce73c21d1f4a8aa11bbec1bf6562e9ac73bc84d2bd894b
font_01_sfnt_off00011e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13667 11024 bytes
SHA-256: 3f4f2d10cf4f23942e29d34ff8db0c5d58199ee0bef062c2f548de21a909b768