Malicious PDF — malware analysis report

Static analysis result for SHA-256 402acd0dc3f7093c…

MALICIOUS

PDF

80.6 KB Created: 2021-09-14 13:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cfc4a315ef3591554b8e0577ce9afafc SHA-1: cd2c5b0aea33d3579ee5a3e1f627ba55f36d0f14 SHA-256: 402acd0dc3f7093c1c9a150c9692a24d4b539d35a7b014c52e6cd25f658e35de
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, with several heuristics indicating it's part of a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or redirecting users to malicious content. The embedded JavaScript is a common technique for executing malicious code or initiating redirects within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://akproauto.com/nbloom/fckuploads/file/15165951940.pdf In PDF document text
    • https://gallerylingard.com/uploads/file/46701887059.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/tobugimexavatekutopakodu.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/29312951027.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/nidugedelef.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/91663659614.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/8b7e25b55e0e62388ea3fe8ee7a5ff36/robevutaxa.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/jodezalibijoporufeni.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/sowategaborolunopi.pdfIn PDF document text
    • http://beijingteye.com/upload/files/segomasa.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ff663ad1e---27056380949.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/69772703728.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/kasinokemog.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/zowivipugax.pdfIn PDF document text
    • https://mcsfood.com/images/file/dojekiwovod.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/13991397117.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/pidiniwuparozulalub.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/36611903559.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/41698207205.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///zolofemikeliwasisen.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/kujukotipafutajewezo.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/xutenonojekoladejegi.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161323abcc3742---mazetusopenulokidu.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/gonaxap.pdfIn PDF document text
    • https://novitas.ro/files/93260284549.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/puxofe.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/lumezenitizepeku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=exit+path+2PDF 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_off0000d632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD632 18696 bytes
SHA-256: c79a24488a2dc7545aff0fba87e49a4354fa762f13ed52faadef6242f2e5e150
font_01_sfnt_off00010757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10757 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6D 9884 bytes
SHA-256: c2be0b4e5c9fb74905015607a4118616f7827b85498093f5e7fa0c321e122655