Malicious PDF — malware analysis report

Static analysis result for SHA-256 334fa7e67a82bc55…

MALICIOUS

PDF

89.4 KB Created: 2021-06-25 21:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7b1da0143769b2b4a3af381270bb5b2b SHA-1: ec41bfbfc2b1aa6beec4dc6d8503b95992a5ad6d SHA-256: 334fa7e67a82bc55635bb4065dfa52381ac1e7d884b6d62fe5c623368ab49d3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate a phishing or trojan payload delivery. While no scripts were explicitly extracted, the nature of the embedded links and the PDF format itself often leverage JavaScript for redirection or exploitation.

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://ketchas.ru/uplcv?utm_term=play+gameboy+on+iphone PDF link annotation
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b78b1b8594c---58601493174.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/ffk0osameocknhb75b0k66k3l2/dukepajifo.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/95558520103.pdfIn PDF document text
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/fipevozej.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/87804987003.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/b2sakp8s73j8h40mg46lohdsce/fumelorizu.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608827cb012f1---zemezipolamojekar.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/cd9318f0a33593b18644066cc867d334/90942320648.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///80303506645.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b943171527f---nekinedasafobodigufowa.pdfIn PDF document text
    • http://mountcalvary76.com/clients/9/90/9062e1c9f2360b2cedac6e2854879500/File/29040361862.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a14c5d89253---besigevazifiriza.pdfIn PDF document text
    • http://kleiberit.ru/files/file/padazop.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/funulelum.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/49933917477.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/81655837379.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f69db9bb2---12892819460.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a9dbd0f56---lisiv.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/f85131e92a82afaebc656e361dc9abf5/9182163609.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/bitubifomuforekomuw.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/mepebitabanitiw.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/6c9fe49894d410cd8abba4a0fd9565e9/56917218009.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085d49c1031c---dakojajuvelepisifinepogo.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/17803309189.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2da339ca5---83895916660.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab72f2b8a3e---73414126115.pdfIn PDF document text
    • 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_off0000fc0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0A 17088 bytes
SHA-256: c5ecf98cfe431112dd3403d71cdbc04139f3cd21eeb2fb98388ee3733cdc556a
font_01_sfnt_off000128cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CC 10588 bytes
SHA-256: 9cda7b3864d5ad5a60f473573883605053693f5566a1f4ce47053a201132788a
font_02_sfnt_off00014084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14084 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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