Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a8bc9755b369df…

MALICIOUS

PDF

77.4 KB Created: 2021-07-26 00:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f9d43f3a05ace130fdcab886f2052808 SHA-1: 83c793e72a613114fe99a0b8aa91b779da75653c SHA-256: 98a8bc9755b369df531fcf01a3c31057ba7d0c429ecc87426038aebf0e4f4396
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to phish or distribute malware. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d48e82296---30086297916.pdf In PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202107210655211809.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e363cc82353---jotapa.pdfIn PDF document text
    • https://plasy.com/uploads/file/18253164753.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/51406860437.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090fdc0748d2---wirigodubizenos.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e74f23460---69462038986.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/48295685912.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/rilujugoratexi.pdfIn PDF document text
    • http://healthywithhart.com/res/file/30668763684.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/xefogav.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16094b32f9b8a4---fupimabogonevigi.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0192498700---tawamilavuwukobejeponesep.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/3722255347.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e227c23841---jomotosolo.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16085db8b2cdda---20112987064.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/5b05a4038923828bc6ba01576a08ca43/ziniza.pdfIn PDF document text
    • https://moolans.com/uploads/files/dosobonudebosebi.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/mupirimosezuwukivabep.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fdd72e4ab---tisavimadajivumesonodabu.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160826b17eb687---zalibutizixamazulura.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/nojisirovutije.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/ca3964e202c725aa32461395e04d578e/baweviviniwazuv.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/62482687447.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/b49008021d780d0f1cf81558d5bfae04/bikumadepajosudaje.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/felenonunuzolofezosos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=super+mario+world+gameboy+advance+romPDF 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_off0000ca72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE284 17104 bytes
SHA-256: 602daa5d56d320ced3cee2d8fa4cb68451a5a22824b67d1b219b2f63ff75b01d
font_02_sfnt_off00010e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0F 11172 bytes
SHA-256: 041a16bf695be7daae83ddde50692fef588ab573155459166681015b751e7c9a

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