Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f97d900d64c42f5…

MALICIOUS

PDF

78.0 KB Created: 2021-09-12 16:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6f3d2e00bb44a3ee12dbbe99614e5645 SHA-1: 4021f91816b365c9182a88e3dc130cee36a8eca0 SHA-256: 7f97d900d64c42f5822a0d1fb2f4852b92e6b2c2ee053abf3282ba6f000999e8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to numerous external URLs, many hosted on potentially compromised or disposable domains, suggesting an attempt to distribute phishing content or malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • 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 http://tccsrl.org/userfiles/files/vopojogavigegiramebo.pdf In PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/2b2975a24a30e0da51054d1e02845c5b/32181628640.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/31557737337.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/xosegadiwenozumotimevixe.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/26069365298.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/muwukefan.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315711408e8---40432257682.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/gaxusagipunivamipokon.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/92883272326.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/93944387480.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/wimupamipubadu.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/zofezebagomodozunaraduz.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/73487958066.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/kenunuxatapidezozizuwuguj.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/gazevedefijovuvaxelaneso.pdfIn PDF document text
    • https://flyags.com/editorResources/file///24744833480.pdfIn PDF document text
    • http://web5gstore.com/Files/files/pimowoniwupozikoma.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/33328087146.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/kagivujoxugid.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/batezoxo.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/2972151270.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/89071274905.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/87136055855.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/k5imer4ksdm3qi26r3qljpr2nh/lesuzulumokederoga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=led+zeppelin+wallpaper+for+androidPDF 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_off0000c82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82E 19060 bytes
SHA-256: 9c35c839f6336573234586593e17fad13cb13cd2ab019611ab8f2e24588ce6db
font_01_sfnt_off0000f987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF987 10328 bytes
SHA-256: 64277d7c4b19c31f94b80443b633fa5442f20386115490ced44af95da4c00890
font_02_sfnt_off000110f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1