Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe133a134c08a14…

MALICIOUS

PDF

84.1 KB Created: 2021-09-23 16:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4d83b044402171a70f4aa37055138c2d SHA-1: 628ffecb1d0a3368b10010f5de083dd7e629c2f4 SHA-256: cfe133a134c08a14f4ec7214d7856cf1440984242d7e6ca12e591e1cb47b6237
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. Heuristics indicate this is a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

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://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/67745359580.pdf In PDF document text
    • http://interstyle.org/content/xuploadimages/file/palonederugidatosaboluli.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/sanevatopirulerirare.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/fikedabedidotonuzezerit.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/doguzozedupe.pdfIn PDF document text
    • http://chineseclothingonline.net/File/94884122913.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/92860320294.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/vipedidolodi.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/64228415876.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/tewurifawe.pdfIn PDF document text
    • http://vollaracis.com/UserFiles/file/pojuv.pdfIn PDF document text
    • http://sentralperdana.com/file/90221205111.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/08cdecd3730bd39ea476edebbe10aa72/rozofevi.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd68fb0536---73417131869.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e354ef21b---noxopurolumiduvuligu.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/50163902972.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/pabakujixopufunozox.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/62439808a84e9c2414d47c3729e6fc79/46653432399.pdfIn PDF document text
    • http://zanethompson.com/userfiles/file/gedoropefojakifewabuk.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143016ce9423---buvivotasalupebavajigata.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b6ef406cda---39381885936.pdfIn PDF document text
    • https://stopserv.ru/files/file/51683769895.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/ruduneb.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/xuwozawezub.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/safavoni.pdfIn PDF document text
    • http://canvangdientu.com/images/file/fuvuvujonifovuvabiliwob.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/zilevidarebamabuvofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=battery+status+apkPDF 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_off0000e1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A4 10244 bytes
SHA-256: 612607857e68a724473cd646a6b9e86c21363e4e38485a0600ee86b957e0056d
font_01_sfnt_off0000f8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FD 18856 bytes
SHA-256: fc96645674ddf08f12c28b0e6d63bbd3c7b1d80712d8e7fa2244ed12363a79fb