Malicious PDF — malware analysis report

Static analysis result for SHA-256 a038323d4d740b97…

MALICIOUS

PDF

81.0 KB Created: 2021-09-18 05:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c5910e14a42094058e991b749d513587 SHA-1: 2f6ec841a01f030bdb185ac79e8d9aca86bc0fc1 SHA-256: a038323d4d740b978dfcb7fe4cb2834d20a524255c3008a95287cb21a0ff31fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document, likely a spearphishing attachment, designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://synerhu.ru/uplcv?utm_term=winning+eleven+8+apk PDF link annotation
    • http://www.chatanakonci.cz/userfiles/file/57583331143.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614064632a9f1---56058164440.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/fomazagetokuzafovavudul.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/8553345049.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/36800153786.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/11f89ii43p5thme68erkgubnvs/lekan.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/15919700533.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/36235018603.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/64116550735.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/6049422652.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/4787795869.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///xosibogezuzumutop.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/27bd8140c3252b44108a357f4bd603a5/witenajamupazoruminoti.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/65052113411.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/xetupoz.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/84924126746.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/j0e3p8o6vcp1d68orlksuu1ts6/guxodemupavozidedoda.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16135977d02531---64353777555.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/35847204657.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/zawisafowivugut.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/53197495864.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_off0000d8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D8 17888 bytes
SHA-256: c4aab71ddd17176ba7d7b6df60ed0de9549393b89e6d8bfc68f5ad3228487835
font_01_sfnt_off000107a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A1 10300 bytes
SHA-256: cec0fae14e9faf590e7faf1804754fe79fa65e145997abb15a9bdccdad529cd6
font_02_sfnt_off00011ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1