Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c2278697668b9bb…

MALICIOUS

PDF

71.5 KB Created: 2021-09-26 20:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0c2018913e013ea5791aee851b72e4c6 SHA-1: bf720ed582c2f15675f1f49ad57f28340a1b9437 SHA-256: 9c2278697668b9bb5c613f0bfd76f59e23f09221952866f1cfd935f357401eea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for initiating the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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 http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130767cb6652---55699206293.pdf In PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/kisokumenadureju.pdfIn PDF document text
    • http://bidadapatidar.com/userfiles/file/56875167871.pdfIn PDF document text
    • http://tech-in.info/bramy/userfiles/file/wakubu.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/sixenolagumodovanivubo.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/96196072539.pdfIn PDF document text
    • https://matricula.arendic.cl/files/39860911786.pdfIn PDF document text
    • http://moretonassets.net/userfiles/97188794010.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351703c88ae---zegulakijekisoxekemimiwag.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/39a3583c82711e71c94d61e25b885cd7/79506376205.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/vi4395hbpcesi5f634ci5h4tuf/zuviliju.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/4734193864.pdfIn PDF document text
    • http://korvioinfotech.com/ckfinder/userfiles/files/6842998900.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613cda75bc5f5---76087467103.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161359019334a2---vafemudusaxazemapoza.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1631549101.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/26260461710.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614270d70bd74---zofutenupudaxixis.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b01c7a02b1---7847767155.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/12951510860.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/33172660810.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/8393792953.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/gosejuperuwobugulokejemip.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415e8e3c8b9---79452366182.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=facebook+hacked+accountsPDF 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_off0000b386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB386 17484 bytes
SHA-256: 12c23889ab6d8c322d00a405894b10a553547867660537dcfa238bb5e444a6a5
font_01_sfnt_off0000e09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09D 10536 bytes
SHA-256: 986dcc354f0e190c61500e89e6e829460b5fceac5b16b1ce17b7f8caad22472d
font_02_sfnt_off0000f89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1