Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb5c644a00d2f6db…

MALICIOUS

PDF

78.6 KB Created: 2021-08-26 22:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f38bacb3901f767f9f69a65a60280ed5 SHA-1: a2096f88aeda67910090200b7aa7e19b36c82518 SHA-256: bb5c644a00d2f6dbaf033a872423ba1b548fb2832a4d00e3d505b80d11dfffc0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm strategy. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. The file's structure and URL distribution suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://perksys.com/userfiles/file/xudufetoremololewasubazif.pdf In PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/fisib.pdfIn PDF document text
    • https://langumeistras.lt/i/File/demekopejek.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/8007648774.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/86463092319.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/78234823260.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/jumaroko.pdfIn PDF document text
    • https://kildevangen.dk/files/nefizojawino.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/27871916312.pdfIn PDF document text
    • http://skylineidaho69.com/clients/c/c7/c7306e0a9cc1d421caefa9c307ca601f/File/gedabaxogevepa.pdfIn PDF document text
    • https://morabia.fi/images/file/73259746268.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/wozexuxemimegilulazulaxi.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/neniluwazuteva.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/11975894574.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/fd1053f734d12b5057b20bec64a07949/94460063680.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607702ecefbb9---47073366635.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/73659639050.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/0f5d4cf793c135ee0c4e6ec25014fcfd/35809903685.pdfIn PDF document text
    • http://intertravel.hu/_user/file/busexizuluzonojakusew.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/jojujor.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161007ed173e81---xuxuvad.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610124659d687---ravejemeni.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160ac443d0d7e8---26644694582.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=gut+epithelial+cellPDF 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_off0000d16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16D 10120 bytes
SHA-256: a5054a6e99b28d444a61c049e29f8a5a80577366de4d649029e29c157af3098d
font_01_sfnt_off0000e822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE822 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10034 17320 bytes
SHA-256: 5a7b87ea21986b8edc2eca867b54b898bc576d8dc4f6872c225976baa5282e76

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