Malicious PDF — malware analysis report

Static analysis result for SHA-256 100f83e56af21630…

MALICIOUS

PDF

84.7 KB Created: 2021-09-09 01:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1c7a55f1d3a103b5870ab237cac9c268 SHA-1: afeac9828e6c75437dd324f55a9170d5b1fe0b65 SHA-256: 100f83e56af216307ec3b931db73ee5caefe24d2e7fe14ea0c48baf0c9a929a8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable domains, likely intended to trick users into downloading a password-protected archive. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. No scripts were extracted, but the overall structure suggests a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://nomylo.ru/uplcv?utm_term=how+to+transfer+songs+to+memory+card PDF link annotation
    • https://xn--nmqu14inmf.com/upload/files/ragemedivupiterosesiru.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/64e9cc73560e4486f2b68ad10e0a2fb3/26708660010.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/3c7f8e99d7c41a57e86579632a58f337/fufojizimu.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/dawakadevodenepo.pdfIn PDF document text
    • http://futboltotal.net/images/files/bosorowivolakod.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/donogixi.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/30096990456.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/vasixatofutefikul.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/xuganumonurit.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/lepawibajoteke.pdfIn PDF document text
    • http://eksternest.be/images/file/xufivajajodu.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/11847888854.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/91377291671.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/83362777473.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/22549442236.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/161330bceda96e---riloziwubiwodolojawudijot.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/pulijuzamenijidipik.pdfIn PDF document text
    • http://195exim.com/datas/files/kakupuvawafoxavukalibugo.pdfIn PDF document text
    • http://ty-int.com/files/files/nabojojop.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/4705280771.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/67602640875.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/49728123633.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161392fb2d98bd---27498740874.pdfIn PDF document text
    • http://boki.hu/editor_up/dezifilipogewizegol.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ziletunofafip.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/joweb.pdfIn PDF document text
    • 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_off0000e7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEB 10872 bytes
SHA-256: 855c4301b60c75406ca54e9edceee2f52232af7b3261ec987688484aa90e9a80
font_02_sfnt_off000118e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E3 16856 bytes
SHA-256: 228195cd84d15eeb0114757020ab83a472145265f00604f00d23b7aa5c8e9918

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