Malicious PDF — malware analysis report

Static analysis result for SHA-256 41cb723e1cb1aae8…

MALICIOUS

PDF

72.3 KB Created: 2021-09-20 13:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1e9296b51e2bd29027bd0dd1a3f037a8 SHA-1: 5be89cc3f55f27e4f50824a42a98f3358bfa714b SHA-256: 41cb723e1cb1aae87d290b79b5d6fc761a460b5ebfc50dd5bb455472827fdd01
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of URLs pointing to disposable hosting, many of which are disguised as file downloads. This suggests the document is designed to trick users into visiting malicious sites or downloading further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://crysiq.ru/uplcv?utm_term=download+worldbox+premium+apk PDF link annotation
    • http://jump360.co/upload/files/20210912081937.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/12540334345.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/wuzibinekaledupegorokobi.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/e63229d8d33f10c889fc28b43bf58d4a/33730351203.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/19132496547.pdfIn PDF document text
    • http://393citizen.com/upload/files/61859695381.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/likezikix.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/votataxiruni.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/rozadizuxode.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/2297878937.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/16590425087.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210910_152713.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/81396942196.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/pelopifogobovirusugeba.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/51876582307.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/vekopijuxuzoburigitotamip.pdfIn PDF document text
    • http://fpole.ru/sadm_files/5065912748.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/pogafirab.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/64931331807.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/vewadoxi.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/86422888440.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/54144504298.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140cb9e8155a---letajesikijo.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/foludogubinase.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rn7k88gb15qnr3efl4obj3fr24/terunalesetirelabovukidad.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/29412936855.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_off0000b855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB855 16636 bytes
SHA-256: 4d02585f318947c3cb528f1130295539c2e2aab503b4eaf228e17477242fa085
font_01_sfnt_off0000e2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000facf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACF 10808 bytes
SHA-256: bd9e5bcbf55e0b8520ed54b9cf2792a17b03a4b53645578686a02084d43d6cc2

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