Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe8427333b4fb834…

MALICIOUS

PDF

88.9 KB Created: 2021-09-06 10:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c8bb31aeb9546b29d6524e3c833bb795 SHA-1: f60935d2b6e6e480a40ca81f69b36e5379dab7ba SHA-256: fe8427333b4fb834e6f29056fc4b96117bf828c63d7cab74fd60a99c701637f1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

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 http://mundori.com/js/ckfinder/userfiles/files/pusibo.pdf In PDF document text
    • http://dymenahealthcare.com//upload/fckeditor/file/lanuwipafa.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/jowuz.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/rimewatarimigegofu.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/41c07586b9033a1ae8c400efc86fb9cb/64750708111.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/4681c4dcc13c81601945e819d4ae7758/31714702477.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021061818502791.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/68963497494.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/28082669880.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/gorekepevuvegula.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/40125748887.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/20157326327.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/puvuvatof.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/jetukutaxanowupuwapala.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/76jllg74ccf1uaaq760tcl5qpn/pakenup.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/geoipkn953gv34em1a19ctto14/tidosatejugovelojazazi.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607306823464d---95066998389.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/kimaf.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/65924100809.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210901_060537.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/45544618824.pdfIn PDF document text
    • http://dzwigipoznan.pl/userfiles/file/towekizalezuputadegufinu.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/gewerawexa.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/90616846194.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/gibovisorujilipipivuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=fluke+117+digital+multimeter+manualPDF 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_off0000e959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE959 23200 bytes
SHA-256: afc65ebdd251a0b7e1cb967325c3af69e4161a5c3d38989a8b4de73119e23c40
font_01_sfnt_off000125ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC2 10572 bytes
SHA-256: e7da7ac98b7af978589f3c16844a2d1c45cd3a6d3f6a063bd286deb9de43b2cd