Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ced81a97267e8c3…

MALICIOUS

PDF

90.4 KB Created: 2021-08-09 00:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ad834c71cf732f327f13699af9e47c8f SHA-1: a6ba23ce037bb7d03f566e06b2e7b118496964df SHA-256: 9ced81a97267e8c367df0d19e45a6633dd88fb5bbcbde7574f92efe4257a142c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed for SEO manipulation, likely to obscure malicious redirects. The embedded JavaScript and the nature of the URLs suggest an attempt to lure users to malicious sites, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=salangai+oli+high+quality+mp3+songs+free+download PDF link annotation
    • https://reaga.net/js/ckfinder/userfiles/files/nogomakevegepebuxidever.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffa3fe86b5---solanijumuzikutuk.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/f0b54c0703794e3f855204e63b1067fc/41443145501.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/92700126521.pdfIn PDF document text
    • https://pmms-online.com/assets/file/76816054478.pdfIn PDF document text
    • http://kyea.org/imageuploads/48501928096.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/a4ec7fd67fb32e006ce340d2cc1ff428/bekawijakokexov.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e4c752806---rudunoruperu.pdfIn PDF document text
    • http://fygl.net/uploads/file/241653352328.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/c6hf0m6hfdfsbv6uq1969ose80/potufoleraw.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894dffab4eb---kuxadanexefelanuji.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/86879752901.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/bubejeke.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/dc963d59d47054ad94aca6ebd1d70c1e/23447428188.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c82cb46db---70335624240.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/8b96a3eed19aa2b96522c443fb4c7f93/66374138528.pdfIn PDF document text
    • http://medica-brno.com/files/5245916909.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/5406b8a1587b14b0b7266e5e1392a0e1/4101930444.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086897409fff---xasetijofabug.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/xenetiwizebozivunexi.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/kozupukeguxidug.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f302ff90a0e---potokekumiroxetezoge.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fde28ce13---34566197141.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/28b433fcfaeac0214fa42255ba617d45/tazogozobekasusojolujalos.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/292cea19df9ae472818c0267e53b1279/17074436634.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_off0000faf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11307 17096 bytes
SHA-256: b5d6cb0667f42384e5bdd2dcbce0cab395ab235dbc7f06f6a2a93e960a0104dc
font_02_sfnt_off00013fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FEA 11636 bytes
SHA-256: c8ba45376ad904aea980b0fb63cbfef523f6635709b711667981dd040ecbfd78

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