Malicious PDF — malware analysis report

Static analysis result for SHA-256 a84c7822d66a67a3…

MALICIOUS

PDF

83.3 KB Created: 2021-09-21 12:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2b13f2d5ba7455a761bc89913a8b4c9f SHA-1: f158e72aae65cd742fbfcfcb0c7ebd284f014656 SHA-256: a84c7822d66a67a3106453c9aff2781d17f8131e12792d5c4230281e75e531bd
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised web hosting or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed for SEO manipulation, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests links to malicious content hosted on compromised sites. The embedded JavaScript likely facilitates the redirection to these malicious URLs, aiming to trick users into visiting them.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://www.l-games.jp/js/ckfinder/userfiles/files/44129886921.pdf In PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8bqk7c4fb0n9n5ups32qcabao6/36176985576.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/nufenixowiwisegati.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/33950807623.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/roximifofamuruka.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/soxog.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/53478959695.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/puwimigetijifakorelo.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210917195007.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/11339643987.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/37763426414.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/41501103912.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/5454945854.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/kawitojasajujuleru.pdfIn PDF document text
    • http://rooptex.com/uploads/96227179607.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/df8aafa081079ed72e70b68f68dafa67/18086838175.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614732e1294c2---77893551942.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d2994bc77---vegifewor.pdfIn PDF document text
    • http://sushibelovo.ru/files/13772494191.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/wuwovawoxobefuvaxe.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/jinatola.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/161479653390ec---zovasuxaxameza.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/89509288452.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/simepixiwaxej.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/melukusul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=watch+no+time+to+die+full+movie+online+freePDF 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_off0000de69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE69 10732 bytes
SHA-256: 6338ee7de07eb44ebb6c8db197567b14a21f801ab110c6d179302fee2667e14c
font_01_sfnt_off0000f6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFA 18448 bytes
SHA-256: 09acdb2a412cabfcc899295a7a2ff95a3667e2ff43e39282fb8f520dbf3fcecb