Malicious PDF — malware analysis report

Static analysis result for SHA-256 90edfff9e452b585…

MALICIOUS

PDF

94.0 KB Created: 2021-09-06 05:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 81d1e15ea6fc1b51aa6c78e5bc102969 SHA-1: 0fcc08ff098a89dddd9ecbf9a3eb739bd1149bde SHA-256: 90edfff9e452b585f528dd81ffa5a876c76fc03cabb99578c9d84dac474baafa
204 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded JavaScript and the 'Browser extension / update installation lure' heuristic suggest the document is designed to trick the user into downloading and executing a secondary payload. The presence of numerous links to potentially compromised WordPress sites and disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://feng-shuiworld.com/userfiles/file/mewojutuxeda.pdf In PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4718dc799c---xesanefede.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/32170214268.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/nagezijokolasuziridakij.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083fae74ba06---narobudakexuboririketuju.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/monajixalogeranik.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/21471833404.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/30459542812.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a8be883d5---39684111401.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/5cde71b8802470b560be3c45371a0cfb/badizimaw.pdfIn PDF document text
    • https://emmaushuis.org/pages/61413344004.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/04a96b1839763ddc0f0eebf5f0e44a80/sozelosewofuzoluwatex.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16088e1508abd3---kogasodukus.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/vinozosamimaduluvi.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab16adc392---262938769.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/a766r2o78el00rs130k5l25t92/wirisuf.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/c0268l658kvq5gf0ubl9lhl1hl/13651339478.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/qp5lcfb9s50gndrq3t6shj8g6u/99301677977.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/dadogubutifotudogepakixe.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/9426059075.pdfIn PDF document text
    • http://wamer.org/userfiles/file/dobunilijutobig.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/37226512500.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7dd7a721d0---sufejoremezev.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/fotunimoguwuwabuxi.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/66342868700.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=sony+smartwatch+2+sw2+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF07 16384 bytes
SHA-256: b5cba810ccacd47bd6dfe858c2b1274c49fc2e3fc3ae529cbb14c80a65ff9de5
font_01_sfnt_off000105ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AC 10764 bytes
SHA-256: 6d0ff8c5677a548c0474cb061e0bcc41b95bc41b93db9d02b07d80b2dd021308
font_02_sfnt_off00011e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E66 18928 bytes
SHA-256: 1299d7425aed5b06cd6c4874cec221491f0743645f43bfe88a2e2816fd16476e
font_03_sfnt_off00014fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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