Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d49a792ab8cc97…

MALICIOUS

PDF

102.8 KB Created: 2021-08-01 22:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e1931a3e5134e6a5456d65e345025657 SHA-1: 7e64f8b24b16de38fcac3c06f7a8b9ef22654983 SHA-256: a6d49a792ab8cc97a39e70f0aab16a879ec767843a0042edff346344030714dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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://synerhu.ru/uplcv?utm_term=thailand+visa+on+arrival+for+indian+nationals PDF link annotation
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/0d12b7eee6fbb09e85edda6065060b89/69282837714.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c150094ac8---10850176115.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/69997470363.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/lmg520n7854i9ckfuo42f8n9ja/22674891835.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/85dc59d1a2f70b58e9e363225c6e79cb/liwogukopilukugujorusu.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/mumuxubamogejevizakone.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/55270312208.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/buxumovuwunobimesej.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/mikejoso.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/c4b50207b226c08c86d49b47811b8f8b/62393999.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084e6dc3341c---79314352352.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/65178295687.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/vunovemefo.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c568733fc58---17859338510.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/25ec8dbaa71f13a088d968b592544c85/fiwasutifeduzuvenevu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160872c6222c49---dexafelefobixerasubamipe.pdfIn PDF document text
    • http://jump360.co/upload/files/20210616081358.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbbbb8ffac---10448986113.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/gedobovubebexogodijab.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/xejuvefumikaxemezas.pdfIn PDF document text
    • http://luatsutiengtrung.com/app/webroot/uploads/files/katumikonalunowolemad.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/najataba.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/up9hio3i3sro3boju3u87du6u0/94981144514.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/445ebddea8d9db392f0830809924f58d/13488512790.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/e18e9f5cac031d7d793d3d5cefc11894/gibejeset.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160831893a8560---7629956721.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_off00012cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEC 18348 bytes
SHA-256: 6eeaf0716efe85457d07c336412ff6f5ee9782e56ce8a18d84284a177240e650
font_01_sfnt_off00015d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D20 10348 bytes
SHA-256: 131c1c8026bfb6f6ccfac9216c2da6836db7630d2d2ac8d2868ec7f8adfcb68c
font_02_sfnt_off00017466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17466 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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