Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbbd4fae046a8eff…

MALICIOUS

PDF

80.5 KB Created: 2021-09-09 12:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d9ed946d14beded993ef6e1c31deeafb SHA-1: 2b538f87f460160abaa4812cab94da2174df1965 SHA-256: fbbd4fae046a8efffe46eef60f39b9ce42b2e9027894d635dd4cc9cbc13d85f6
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 disposable hosting or compromised CMS upload directories, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://siemreaptraveltours.com/userfiles/file/77173949479.pdf In PDF document text
    • https://rajatotogroup2.com/contents/files/goperer.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/41214229275.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/jubixujexosupovenam.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/tomagewepinafexuwovumamax.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/81807419127.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130197d94da7---bitadujugo.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/raninisu.pdfIn PDF document text
    • https://esvigo.com/upload/files/77991774872.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/xorusodesewera.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/42379025825.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/gogilifikatijelekibunone.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/pokapixijoseva.pdfIn PDF document text
    • http://ruihuitax.com/files/file/xevanisi.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/dufidi.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/b94563ac81c14a6276b041dc9166ffa7/15211025253.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/jowikalokoriganolopen.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/t3uin19er4m5o6qv41lg206sr7/63693955487.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/finekiforudowobazu.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/55639419282.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/84388816631.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/30653887106.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16131b92060f06---gomexav.pdfIn PDF document text
    • http://dominant.name/userfiles/file/kizimeripapejijikebepo.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/mekekumikifugapil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=finding+gps+coordinates+on+iphonePDF 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_off0000d68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68E 17524 bytes
SHA-256: c5901e2a087dd12831cbd2f3c80d5d199bf654139d62f16f52eb0d368c1245fc
font_01_sfnt_off000103fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FD 10724 bytes
SHA-256: 8ad79d65545dcb37c2ac15b41ae19f7d5f55fce4241e7ca5db57266c14dcd89c
font_02_sfnt_off00011c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1