Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb93e2953c09447…

MALICIOUS

PDF

86.6 KB Created: 2021-09-01 15:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a1a3e82f66d8290aefe2210cf53c7869 SHA-1: c1221e1e1f7ed6d37f38a7bc274426304e992e6b SHA-256: cdb93e2953c09447f8b51147e634afe74af45870146e1a42dcdf867f4d487dcc
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to compromised CMS upload storage, a common tactic for hosting malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure and numerous links suggest it is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa84d3a8d4---jumodalewar.pdf In PDF document text
    • https://gachbinhduong.com/upload/file/fotevutigupezalokipakin.pdfIn PDF document text
    • https://tipresentoio.it/images/file/38132189629.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/4f8c7987381f9cf74a5282fc041b9842/mizosogadufudekemazoge.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161216c554b783---sojajakasenifevolukolezo.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/mefukupubonatit.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/gukivikexajen.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/jexegutawagikesite.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37567394811.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/vikixawupumazobuso.pdfIn PDF document text
    • http://sddshchb.com/userfiles/file/Fl202108301408239609.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/33000e0eabf9b0bcb93026c91061b5f7/55163266567.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/62087131666.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/nurototetasa.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/vavevunozasafepu.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/wavedixatobafikad.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772ed4cc6a3---wiwepefoboxava.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c7b520336---47693195760.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/disovesaxuxoniforisape.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/juzikapetadowuzexofuran.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/b3c9f1dc49af5313055629a1679a6ed2/goziravurogobimisom.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/66cfe4d910070f5181d6b3fe9f040a41/bunasezozepadevedu.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6c2ad2cc2---pilubojogurus.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210831012208397501012.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/dujizakosa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=methods+of+anger+managementPDF 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_off0000ee58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE58 10656 bytes
SHA-256: f1dfea9ff8fa9429dccb096365af9595057ac354ea1d77cbedefa2e878715b82
font_01_sfnt_off00010661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10661 17324 bytes
SHA-256: 03ca5940276da51a6e6973338e518972904fb7b18b963a84342ce3682953fce1
font_02_sfnt_off0001332d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1332D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1