Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f227465b5778a5…

MALICIOUS

PDF

86.7 KB Created: 2021-07-14 03:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a616f7831900cab309ea37aadf35a1f3 SHA-1: 4ac042650b1a43985e227b501ee571c342d44ee4 SHA-256: c1f227465b5778a51dcbf5e8fb7bb85cf72d2e77149579e37abcea39241369a8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to link farms hosted on potentially compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing pages or download further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/2f5ae7bce34a491c5665993bace7be1c/rabuzemerarikediluvofome.pdf In PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/vewinulew.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fa220f248a5784edb63622f768ecc2c1/29891006099.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/9116063028.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/larirubezilakiso.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/81241031999.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/jajofonepiforufu.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bc01aa68c1f---movagotifasasuwim.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/xusamowivowevi.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/nujagerukagixotakaje.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/7polqphb7uhu2dnntrb0b776m3/36535407312.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/difegugezipeniduzojejarib.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/91596130849.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/cfff65d1ec6b2804fcb72463e16e4a94/senarag.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/titifokesuvilatonagemise.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021052801492129.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/33217888085.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/xenevegudazanukufufumu.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1837d59552---37709462781.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16072bb9f51f4d---49255321840.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/foc7vir2d69jh4hfob9p0l0qis/xosotezuwemibofusi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=adverb+worksheets+for+grade+5+with+answersPDF 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_off0000eeff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFF 17168 bytes
SHA-256: 8cc4ed098ff019a0f7634e810d2e92d4a6bfe9b373b85c18b9fd3d54228b8c41
font_01_sfnt_off00011b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8E 11088 bytes
SHA-256: f1b7033ba1f0fd0b70364525c42652cfa438b4c0aa554eaae4911c69993a496f
font_02_sfnt_off00013544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13544 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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