Malicious PDF — malware analysis report

Static analysis result for SHA-256 9789de3ddb2e785e…

MALICIOUS

PDF

98.0 KB Created: 2021-06-28 13:19:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: c89bef6d23eaea319a52625afa1fa81e SHA-1: 0256d10cc4be10e330444acc2060525bf320ab02 SHA-256: 9789de3ddb2e785ee45f47e989ab54ea82f32456ef8131e47207d86c27b98ca4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains a link farm with numerous URLs, many hosted on compromised CMS platforms or disposable domains, designed to redirect users. The primary purpose appears to be directing users to external sites, likely for credential harvesting or further malware deployment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 http://ttccid.com/userfiles/files/70067006953.pdf In PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/5a30b8fc1d03f4dd77059084c4f70eea/momofilane.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/powimujukipegirejuvekupu.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/3ff1bdbf5c76f4fdb043a53a8193fccb/nefutugudoru.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/18f5e44c8d27dfbefc894387c9d7cca0/ginizijajedonozuxupirijox.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/sg7enngvv5vlchqcujvncnbv02/77524464139.pdfIn PDF document text
    • https://avvocatoboretti.it/file/kugawakefe.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/sebefa.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a1e80646f---85611846432.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b3fe97f65---30725910798.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/6a8dgjh91afbpvqq5t8p82hjl6/wudezuxasanonejubibavevep.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16082029bc63fb---memaboxijupenolanoso.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c043296414---31736343120.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/207a3f2800282b3a38290abcecb4ec04/xizubabubokovapidi.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/kuforejowedawesobavidusu.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/13266785134.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///77704458138.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5c442e40e---3583652752.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d8bac1bf2---virigilivezafogaz.pdfIn PDF document text
    • http://lighthouseofworship.com/clients/44803/File/bukuwevanuxas.pdfIn PDF document text
    • http://megalaserasia.com/upload///41460882012.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853986b1b65---zavikasinozojob.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160c5786ae7458---1763131218.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/k63sona3f5mts88i1midkjcg45/negamexazukute.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c0924f1f4---bugonal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=transportation+manager+interview+questions+and+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_off000119f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F5 11048 bytes
SHA-256: 374f0b385924a8e746fcf7244abdd055eb61467d48cfd7b70815630399bd2196
font_01_sfnt_off00013336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13336 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B48 17820 bytes
SHA-256: 2075bbe8ebfb1f6e8c558cfcdb3d4d5ad0beefc258618aac3d59db4fbab5240c