Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a3b2709ade11bc5…

MALICIOUS

PDF

77.8 KB Created: 2021-09-05 07:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 601c9131bfe8d201870728a2a5846e38 SHA-1: 181242ab10ee9a239fcd4533079f570e7d7c1882 SHA-256: 7a3b2709ade11bc5aeefc4ea753793a3e6c8cb0c4582fd06d6fd6d0934521e68
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. The high number of external links, many pointing to compromised WordPress sites and utilizing UTM parameters, strongly suggests a phishing or malicious redirection campaign. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://irlanc.ru/uplcv?utm_term=natural+disasters+flashcards+pdf PDF link annotation
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aab1ed927f---bemosejijapuriz.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/82724903798.pdfIn PDF document text
    • https://www.micd.edu.np/ckfinder/userfiles/files/xugidom.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3290aba98a---86996609915.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/58603135342.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/14144694024.pdfIn PDF document text
    • https://ratosatu.com/contents/files/noledibopo.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/tv80vf6nckp089i8gssf7rroai/gikebumiferikezo.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/8jo03rjh9c45csh6jkgfgn91o4/nafizitasivogifezedeseso.pdfIn PDF document text
    • http://whsclass1968.com/clients/f/f8/f849445bb2fb8f42e7c863050dc1ba38/File/sokopowegosejivelokege.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/631698081.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/lo6tgp2li142160lib4sbs63dg/bukokefoxezofaviwabosag.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210722032949.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/70610150329.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160708ce356cef---16213029910.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712728adfb4---1755214809.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/85c55fd3c332a0721d154867a608e130/98092327658.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/evu2fin5o93nrhhns0iqvkkrmv/zonuga.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/xorusupevajajajepizo.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/9911534115.pdfIn PDF document text
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/23158576016.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1682d67ac---wigokedubakirovafexax.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/61668642819.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/jufazobaziwifojexa.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_off0000cb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB05 10572 bytes
SHA-256: 1513c4cdc1ae46dc10c3bd71a499f88a9dcc8ba89ffdb3714814cd55fd50f41f
font_01_sfnt_off0000e338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE338 17716 bytes
SHA-256: e318a9b861f446ca5111d175ffe94b4671bb056b0942b181060d516399cfb80c
font_02_sfnt_off00011170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11170 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.