Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d73ebc04d4a789a…

MALICIOUS

PDF

68.2 KB Created: 2021-09-26 02:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 705f306b9bdc116b98670f4db5e2b01c SHA-1: 78561adc766cb7e17ebc12067b1f03bcf8967511 SHA-256: 8d73ebc04d4a789a51db53f2ad6f3ac21254b1f503a19db47b90e1702b6931fe
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including being image-heavy with minimal text and containing numerous links to external sites. The presence of multiple compromised CMS upload links and a link farm on disposable hosting suggests a deliberate effort to distribute malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate it's designed to redirect users to malicious URLs for payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://wastran.ru/uplcv?utm_term=free+fire+diamond+hack+version+download+2020 PDF link annotation
    • http://kitpaisal.com/mypicture/file/42090787344.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/38894516748.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313feb3e481---43280123928.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/kosinelivevesotape.pdfIn PDF document text
    • https://draw.pt/home/drawpt/images-editor/file/fujorabon.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614094fbe4ec1---64764529788.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/81732177337.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/mafivaza.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143bb47144d3---zirotapaludokezazotudegux.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/porakojudubexoz.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/zudogagufuwegelivozimiw.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/xotiwabopuw.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/6968703640.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/bifesixulikudowofepul.pdfIn PDF document text
    • https://agatanorek.com/files/file/45565778630.pdfIn PDF document text
    • http://pasaru.com/upload/files/xodupoxujeduv.pdfIn PDF document text
    • http://foxadv.net/file/juzedor.pdfIn PDF document text
    • http://boardmark.com/files/file/maduzexusolunixu.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/54068960795.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161422895a2d1a---bumasi.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/jezuwapasebadesawub.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613172a4742ad---74496867092.pdfIn PDF document text
    • http://erimti.com/userfiles/file/zemubutodusotofupos.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/zenapawunuzemubojug.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_off0000aed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E8 13964 bytes
SHA-256: 51a5cbfee47386583cfe20a29208430df6ce7187cfaf59a502786863449a8b82
font_02_sfnt_off0000e92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92E 11104 bytes
SHA-256: 99ae06092f1a967ae2bc74e8b4bf5f778c566af4911d26587fb5ef9f6897261f

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