Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8cddde218ef1495…

MALICIOUS

PDF

67.6 KB Created: 2021-10-01 03:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: babf1d1007dda84472f973ee6ea7e522 SHA-1: 0e6ef42a89208a5d73f15d34a47f1e29dc524926 SHA-256: f8cddde218ef1495e68cfe9db21c2711dfda325e4c48731fffb93a986e967298
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting. These links are likely part of a link farm designed to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://crysiq.ru/uplcv?utm_term=android+app+image PDF link annotation
    • https://hantverksakuten.se/ckfinder/userfiles/files/5436089400.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/malofenaturukajij.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/totimidezejuzupokemu.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/dajetopag.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/73115088020.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161331dc6b329b---wefuvasalepigugupulew.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/nogewilavifejaxu.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/75004323054.pdfIn PDF document text
    • https://ekransamara.ru/files/kopak.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/jebakaziverotowagasenafuv.pdfIn PDF document text
    • http://brukbet.com/user_images/file/turojewugodilumukemojifo.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/77627342170.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/kizewovegaxopoj.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/44725936152.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/39914021412.pdfIn PDF document text
    • http://popmetre.com/news/files/47096748020.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/q75fgbmb451fc46qvsul1gpeo6/83702384614.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/25733e14819e03b75cf5e2b8dedc911b/93105101498.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/laxefikuzajasuka.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/2755155928.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/sadafepajelu.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/37171934064.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_off0000ace6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F8 15064 bytes
SHA-256: a4f9138ffce5b4f67d2fa019e62dd00681ccbef31d3514251c0846cf546e7181
font_02_sfnt_off0000ea61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA61 10404 bytes
SHA-256: 3b4f3c56bbff57e167d5d3a5022727910f7b39545cadf296c2f5582052bb90a4