Malicious PDF — malware analysis report

Static analysis result for SHA-256 24e3e89345314a7f…

MALICIOUS

PDF

81.7 KB Created: 2021-09-12 09:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5eda03e59d574bf6da92e9eb845eb58e SHA-1: 0749045fcd87b06d61a20e70d1d058f8feeb25e6 SHA-256: 24e3e89345314a7fa63859b45d3c9668d321d5a731eb7cf4ce76e952dd39fc3a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. The embedded URLs likely serve to distribute further malicious content or lead to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://krisoc.ru/uplcv?utm_term=date+a+live+wallpaper+live PDF link annotation
    • https://vinasimex.com/uploads/file/degetikolevafej.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359d47bcc3c---72672374565.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d42c8e187c---83860370166.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/sasikeraligudo.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210909124557.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/gitokijerixesok.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/rruffahscru03ptob6kdfubn4v/miremeg.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/65302104808.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/xopetepimig.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/rifaw.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/lusetabofuxesibiji.pdfIn PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/61264864947.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b0b20d7c8---ruxeni.pdfIn PDF document text
    • http://ace-pharm.com/upload/files/zekavu.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/rekuporuwutilaweg.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/solezezu.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/15903832834.pdfIn PDF document text
    • http://liluby.com/upload/file/68290977312.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/xekagorowixoso.pdfIn PDF document text
    • http://www.travelwithtaangoo.com/img/file/20152716643.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/jarulujupisifadub.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/wupimiradetumikizotom.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613459f1b7ed6---lilolemov.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/54793952051.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/92734885936.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/9045hrvnaf2n1nqi8pgr4chsvf/33309168773.pdfIn PDF document text
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/gexanufigozafulaj.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_off0000d811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD811 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF023 19752 bytes
SHA-256: 5f7ab2c856dd13f7fe67439f74108a45f1fee0ad5a7409800b80feb0352862b1
font_02_sfnt_off0001225e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225E 10008 bytes
SHA-256: faaf039ce968f7445ea540b3dcb4261db014da9a5f018e7e7907074f6c671f05