Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc684ce18d07ece…

MALICIOUS

PDF

80.8 KB Created: 2021-09-19 23:38:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 161d785f3165ba4bdb90344577b80e67 SHA-1: aea064b2390bb7f6f04b5dd36d30ba8be1ce81cd SHA-256: 3fc684ce18d07ecea6d53fb96fcad0319387e27a7bfb18d9b1b52176b51d76de
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it's a link farm and uses a password-protected archive lure. The embedded URLs, while some are marked benign, point to domains often associated with hosting malicious content. No scripts were extracted, but the overall pattern suggests a phishing attempt designed to deliver a password-protected payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://koszyczarek.pl/userfiles/file/85233280909.pdf In PDF document text
    • https://dagvandearchitectuur.be/_files/file/46907877408.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/denov.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109101112072427.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/97417660828.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/44180627163.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/tenufarafunirumunokamos.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/43158918580.pdfIn PDF document text
    • http://change4best.ru/upload/file/pejajafejozenebakob.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613012be25c67---towitipasazetopubuwot.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/bakokudimazoga.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/pokig.pdfIn PDF document text
    • http://rotang.net/userfiles/file/91475925539.pdfIn PDF document text
    • https://renetravel.ro/images/files/kuworodubovibekopuruzi.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/6bf493d188541ad08cc8518b77103789/tetatoduvekubekozi.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/mimutojebisivijobisekir.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/tatawozuvip.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/67580069650.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/25455057645.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/67129099474.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/83951467381.pdfIn PDF document text
    • https://dcimx.com/files/lenekob.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/d026m6k0bkulqfh9dn79df0ttd/54517388190.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+change+password+on+an+android+phonePDF 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_off0000d62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE43 10824 bytes
SHA-256: 975d3921950d7cc3a688e8f5485ab6a75547d0f1b5dcfd229ae1f86d289697ed
font_02_sfnt_off00010700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10700 17976 bytes
SHA-256: e17819378eec574a581c0b6c2f81f5a9f94a9f2dfb6c928a74929c68ec1a4496

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