Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d895169f7e0a1d…

MALICIOUS

PDF

84.1 KB Created: 2021-09-02 03:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2313de5a62cda2a126ec51ef9826dc95 SHA-1: 11cc8220240eb4a43fbd8b69f4fe7901718675a2 SHA-256: 82d895169f7e0a1d0c61f948bc860b4a8ee0d3835ae761fb650d8536ecc53960
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm or SEO manipulation tactic. The presence of external URIs and a high ML score supports the classification as a phishing or malicious content delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/4m9gsgcj8dmf7pqo46nuotf78v/27739440827.pdf In PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/49314670902.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/50904725778.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/kemuv.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/b660f6bdaba601a39bec99b99393bfd7/gexeso.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/53aa0771594db09452e9d70de3302c06/wumegenonasuvisot.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/164ab9367379230ccbc37622a60e9a27/zidebokuzomidok.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210826182411.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/tutivulop.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/26185784691.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecb1d69057---rizakinukemamezuvigexu.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/466l04t379bopio4baa1trp4h2/takirulibaxuz.pdfIn PDF document text
    • http://icwest78.com/clients/67591/File/95175816840.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/wugetegibatuwexisijex.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb59d18cc9---86218977745.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609188d5d942f---94037563169.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/78716877223.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607982f2389b5---4413616284.pdfIn PDF document text
    • http://rococosofa.com/files/files/87512081242.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210717065123.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/gupojilubad.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/85637114568.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857c8ecfc23---15371451676.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/zulozokosigulodow.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/4e6e6d06c1fe2f790e74e1cbddc5e226/suxizokasuzilujajotop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=service+opportunities+near+mePDF 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_off0000e151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE151 18304 bytes
SHA-256: 6d23450d8cd9355add9176c9faa5236ce89ea22092c9fe2bcdb664c1948443c5
font_01_sfnt_off000111d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EE 10732 bytes
SHA-256: 8292fc856e12b0ecd577d5f6ef61252ff4c9442b414f5e5cf7b661a4d1b131ea