Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ad4716949b48a1e…

MALICIOUS

PDF

78.9 KB Created: 2021-09-18 21:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b5c86565f568347efd8918dcd7198190 SHA-1: 877459075d76862427fe49c167f01035235d3f10 SHA-256: 9ad4716949b48a1e86d96b077fec020ea90fdc79071289afd4ae3b92cea3fa9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of external URIs and links to compromised WordPress upload storage, suggesting it is designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and extensive link farm indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://coretry.ru/uplcv?utm_term=can+i+disable+android+system+webview PDF link annotation
    • http://honeycontacts.com/uploades/userfiles/file/81667655491.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f250a1255d---13750985652.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161454db14f188---83871192614.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/sowofowekemiboda.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/sokalotejeguzadivep.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139bf5814c41---ratozezase.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/18699186335.pdfIn PDF document text
    • https://subded.org/userfiles/file/menorakugisaroredapujut.pdfIn PDF document text
    • https://jss-moms.si/upload/File/jakikenapemajorisojokop.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/96410811349.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/88469822178.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/bapegeviretis.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/dowoxisem.pdfIn PDF document text
    • http://polkovnik.su/upload/file/samufusir.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/vujelejob.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/rifelu.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/28719563983.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/tomuporozexufej.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/28434016214.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/21675786319.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/minuzawibisiza.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/37320002393.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/tadifulogujevaxudagex.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_off0000cfbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBD 17456 bytes
SHA-256: 566fdd057908a5e1e2654c1582446fb1a8ab63e1564fc458eec73ed67e18d462
font_01_sfnt_off0000fcf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF0 10848 bytes
SHA-256: e14935377d8eaa8cc241be5639e27e141fbcd5a9605772b6fa61fd617d97b82b
font_02_sfnt_off00011612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11612 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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