Malicious PDF — malware analysis report

Static analysis result for SHA-256 711fe7fca2dbaed9…

MALICIOUS

PDF

84.3 KB Created: 2021-09-14 05:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f011effa169b429e72da510fc5efe8e2 SHA-1: 006badc668efa30b7791910fa4644991e7376939 SHA-256: 711fe7fca2dbaed92a4016c9d20cbba8ee846b79e617a50fc59db5dc83571516
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, likely intended to trick the user into downloading a password-protected archive. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' strongly suggests this intent. ClamAV detection and ML classification further support its malicious nature. No scripts were extracted, but the overall structure and heuristics indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://chcial.ru/uplcv?utm_term=aplicacion+para+hacer+notas+en+android PDF link annotation
    • http://aloisiquadri.it/userfiles/files/29151099833.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/tuguweveza.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/3ce774849648afc541786a4c01e323e7/nesapinoduwomo.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210912/files/20210912173202.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/41652464288.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/7b1f2c2fd616cde5718c5d24402cc785/4852324761.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/waxunig.pdfIn PDF document text
    • http://devveb.net/userfiles/file/92842997493.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/gejinapibejaze.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/98469403028.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/lazekimijemanaduzisiv.pdfIn PDF document text
    • https://patc.fr/imagesfile/30825278863.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/44035817202.pdfIn PDF document text
    • http://ministerium.pt/files/darogokubifutisivowed.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/40288431891.pdfIn PDF document text
    • http://hydrem.ru/images/file/88178496326.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f742c22546---64425578585.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb631009ef---78651000053.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/sibuwadotivog.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/54061154096.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/57459642378.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_off0000e142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE142 19084 bytes
SHA-256: a5b4448f493520b9c6b6dfd4fb98b273fac00b5042501f16edff416f91a011b9
font_01_sfnt_off00011192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11192 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A9 10592 bytes
SHA-256: 740b5302e34079662271763f69a736e765f5a25b1523d4a2bd8c4d3ab610a9bd