Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ed85d092e1e16db…

MALICIOUS

PDF

75.1 KB Created: 2021-09-13 22:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0f35f8446c23bd70b93e75e2df0c2ccf SHA-1: 4b4175cfe5a16160a789c8507392637872ad6614 SHA-256: 5ed85d092e1e16db00d73d6d0dc3406e7a7093409722a11299bcf4dae7c7903f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised websites or are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for phishing or further exploitation. The presence of multiple external URIs and link farms suggests an attempt to distribute malicious content or redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://corpusbg.com/files/fck/file/jegopegabutonukew.pdf In PDF document text
    • https://wupaojichangjia.com/d/files/dafagosatukagofutebefije.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393b0bac44f---ziwowurawalinumu.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/bizuguk.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c2cedcfaf---16098627827.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/busenewurejupumopasezu.pdfIn PDF document text
    • https://33mobility.net/uploads/files/nopip.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/84906132305.pdfIn PDF document text
    • http://allycatering.com/userfiles/16321120213.pdfIn PDF document text
    • http://hflchw.com/upload/file/wakojuwakazadoveg.pdfIn PDF document text
    • http://autovoda.ru/upload/files/3369914490.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613d496ff22ec---gipopasule.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/98835936788.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16130dc17ce78e---vazudaluwufoparukopamowan.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/98626611756.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/a3dd2fc90422cf2280181e2a98aa5f6f/rezibupakesuju.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210906_961B084C7ECF3019.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f989bbca3f---vitugaverurizomorikujitog.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/83644316923.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/kezofafutikuz.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/59496214010.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e13b6574d8---36359113778.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/vopevebinoxovogawisefi.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16136f8ecb7e70---veparozivod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+legend+of+korra+streaming+englishPDF 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_off0000c240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC240 16972 bytes
SHA-256: e18b60d9787a3a0c5d4fb09b180201a618067a6e2f75c1e74b89e8c2baf92373
font_01_sfnt_off0000ee2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2B 10856 bytes
SHA-256: e2f664217a986382aa6fa990e7b8f84341910a439f3646ce226fe40766626b9d
font_02_sfnt_off000106dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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