Malicious PDF — malware analysis report

Static analysis result for SHA-256 d78f7e809f4079ba…

MALICIOUS

PDF

76.1 KB Created: 2021-09-05 06:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d3d6a21d206140fcefdf675f6b670c9d SHA-1: eeb3c647d705a57d5fe136fcc1abd73eb72a1d8e SHA-256: d78f7e809f4079ba451339cef9a314c3af3ba644305dc083a52e5cee368012e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users. The primary purpose appears to be directing users to potentially malicious external sites, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://vidol.nl/userfiles/file/biriwanidapux.pdf In PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/b8619ac1e10575ca290b629b162f78db/26495683793.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073854677528---28992545204.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b033bf0d6a---80643733362.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/mumujuji.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/r2722p1hms5vik56pdhnv5s1dk/5826234450.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/35588232417.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c743ea2f0a8---wezulon.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/kidegedawodarofizitix.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/pixupikixulolezajezes.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/lamutofaxidarubamim.pdfIn PDF document text
    • https://lasanisports.com/files/wokafokumawomipad.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3589a4f2d---sibasokadunatifamesazotif.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/35808530275.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/fcf62e864f9ab50e19c431ac71fb7de8/79429081342.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/a2e0e4a482cbb56d69787a85ca5dc636/39027549213.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/jubifekatetubo.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/090c0ad10ebf25506d0d0d6793011601/30928473984.pdfIn PDF document text
    • https://esvigo.com/upload/files/11225184261.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c11fa6cf686---15601058870.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/mosezo.pdfIn PDF document text
    • http://ilkemymm.com/image/files/rerigupilun.pdfIn PDF document text
    • http://hanleyresources.com/images/baxufezuxirerureduvu.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/71115318015.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/xiwofewedobi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=definicion+de+cultura+segun+autores+de+libros+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_off0000c555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC555 16588 bytes
SHA-256: 9ad5540b26dc3a628f8a7b75bd5bd152ca3e34495ceacec719d3d273a0f81e9d
font_01_sfnt_off0000eeb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB1 11036 bytes
SHA-256: 8b5560f3e80e1d1cb93404e2e08724a9d5990a07855f0a6b204eff01f68d4ed7
font_02_sfnt_off00010817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10817 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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