Malicious PDF — malware analysis report

Static analysis result for SHA-256 77e6e34071eb12a8…

MALICIOUS

PDF

77.3 KB Created: 2021-09-05 02:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 21eedd19b0d1ba58a5cb7e88924cbcc6 SHA-1: 37446aadca6d2d3b9d40ff62f28350ce5f4a1005 SHA-256: 77e6e34071eb12a82e433394c98bc7f3408bf963ecd78444b9eb8358bc8fd102
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The PDF structure itself is also noted as having duplicate object bodies, which can sometimes be used for obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ip-pharma.net/data/files/91627578152.pdf In PDF document text
    • http://chanhbon.vn/media/ftp/file/korakuzasukavav.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612942c21becd---dilebo.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb403097b40---57912380942.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/961193c0ac9f8b1b29e317ed307c9a0f/2586610720.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/mutofopuralojalugojiziwo.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/zoxopotesuvaku.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf9a85596e---jarakujud.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/supan.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/mubowizimawopogutodurebi.pdfIn PDF document text
    • http://hydrem.ru/images/file/1320123877.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/56012138807.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/35531043636.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/vidogegesoboraxaves.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/dalivepomidivasag.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/d36f9ee81b7b2bf07cb7956f8e547382/30969578314.pdfIn PDF document text
    • http://strahyi.ru/images/file/69512692739.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/45400537706.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ad92da4e0---64880515233.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c6be48f52---jofajarunugubobunexi.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/zomiwugadan.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b982241081---viwonigorexuromawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=insert+image+to+pdf+offlinePDF 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_off0000ca78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA78 10792 bytes
SHA-256: 493f14ffe35bafa487ae97426f6d39b58729a3446b5f5113500cfea638bf0d9c
font_01_sfnt_off0000e318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE318 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2A 17068 bytes
SHA-256: 8274ac3c3ce3a2011dfbc89039927bddb7e33cc23937659c605c9a3852691b43

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