Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1d49ee4ee9c915d…

MALICIOUS

PDF

71.1 KB Created: 2021-09-24 02:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f14376e4532556355a86799068fdaba8 SHA-1: de0b21ed40c746aeb6e7799b813b0fa48dd19b83 SHA-256: c1d49ee4ee9c915d393fb9ce8854482d9b202d4a440643d3c9f841cb17ba50fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised or disposable hosting, forming a link farm. The presence of external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' rule indicate a strong likelihood of this document being used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 https://jiu-hang.com/upfiles/editor/files/31116103487.pdf In PDF document text
    • http://someteme.com/archivos/_20210904033043.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/29578526448.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/zaraxeradafinukixeboxir.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/13283006635.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/laxumovutina.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/5a0a6d9e6077c062a224fcde871501e4/62820402108.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/lulexudoxisafamoxi.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/sasagokixamoneze.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161425715e68d6---dadevesopojewakabib.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/66701449524.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16147c80ea46c1---jedubepojorijudiw.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/sidapiwaw.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/daxopeni.pdfIn PDF document text
    • http://engelholm.boj.se/uploads/userfiles/files/8757594177.pdfIn PDF document text
    • http://cwesp.biz/upload/file/zirumet.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/xapoximeraguzagato.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/fu96l0u26b9u68o5dlmbckb2co/paguro.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/65478785376.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/55079361932.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/vuvoj.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff9806d7bb---89519284604.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/walatowegufev.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/53667295528.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=lord+of+the+rings+extended+putlockerPDF 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_off0000b169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB169 10988 bytes
SHA-256: 4d38ed21457f86262305724bafa909203c93939a40ded8680fbfcef9c9df1b3b
font_01_sfnt_off0000caab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BD 16920 bytes
SHA-256: 729f597194b9ccb33a7e3b7813d53016a6378c515e5d1c7748dd5a8a5a0a195e

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