Malicious PDF — malware analysis report

Static analysis result for SHA-256 353a9ea58b819c65…

MALICIOUS

PDF

83.2 KB Created: 2021-09-08 10:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b17288da11dcef1ebce6d7f1a0d1764c SHA-1: 7d12b16a8e1ad78e97ec5c0b913f278db0a95cf9 SHA-256: 353a9ea58b819c651aefd81d1ce4093e9f25488c852d8b7c5edc43cf7817f90f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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.
  • 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 http://tiga.co.th/ckfinder/userfiles/files/pareripe.pdf In PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fa47de6d6a7---zonoxogomeres.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/67546270205.pdfIn PDF document text
    • http://momsystem.ru/public/file/xisidaje.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1971768e3---79513664994.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/87237087777.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcb5f9d904---11833819831.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/24378630421.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079b0c3aaf46---27201411115.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/zotin.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/fezazuzotisejotopupinidig.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/71564601374.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/67924957911.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/7239515879.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da909a82c0---18248950017.pdfIn PDF document text
    • http://runbo.net/upfiles/files/163038144519.pdfIn PDF document text
    • https://www.carrentchiengmai.com/files/51213459634.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/5897631215.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/81531335280.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/wasesa.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/pazadovagevekinafam.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49385736958.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/gupusal.pdfIn PDF document text
    • https://duvanco.be/docs/files/xofasavizumokimofemuja.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/jukorobalomibujujofizilan.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/8c0619337ce9322ebc0771fa5b7eb36d/25643841275.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/4hdl3bg0fncc81221kks37g9hl/figifono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=social+network+definition+pdfPDF 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_off0000e0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AA 17648 bytes
SHA-256: d0489950ad00e838f434c4ab308da3429730ef2091ab7c5f2af6a481aba3af9f
font_01_sfnt_off00010e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E45 10696 bytes
SHA-256: 968c31c6ebc7080f48f7a9443ae082ed897e6ad453c3d02601b82f186c559bf4
font_02_sfnt_off000126f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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