Malicious PDF — malware analysis report

Static analysis result for SHA-256 439a710659386890…

MALICIOUS

PDF

84.1 KB Created: 2021-08-19 01:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a6083cb1afef32e9b2c89e863fc9c80e SHA-1: 421cc89ebdb139f6e6189cf07af4d06970ae1ad8 SHA-256: 439a710659386890f375447e9409366bce963359313f4196b2c8f813882d54cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. While no scripts were explicitly extracted, the PDF structure and heuristic findings suggest it is designed to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://cardion.dk/gfx/fckimages/file/zixezoxuletoralidam.pdf In PDF document text
    • http://esejsc.com/upload/files/fulogokakirebasekiwid.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbca067181b---28206373904.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d836c37640---13343454256.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16075cea8e25f9---saporibovejirubodiwer.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/mudor.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/jaxiwipobivevesekax.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7e60baaa6---sixoturuwivivefadeku.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/e1cebe0a6506dda54d8137cebe746e7e/21500693536.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c24665d439f---10306254143.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095dbec08db3---47927489011.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f39f87c1c30---muletozato.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///86156140978.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/lumumofekelapaj.pdfIn PDF document text
    • https://shidoremicrosys.com/media/88847407588.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/vubagunabipomuvibuvomujiw.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/46119767657.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/vt92b8cbu2s1hj699hrb4ps1h3/59233785721.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210615_195447.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886335858bd---bafagixogovodozuwubaxubo.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d28b8122078---zupudokakeforulexitija.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/104f3b513742ab9615fa63c6f73ffcb2/wutogatepet.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/vogupamajerufaguvi.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/fa9839ab889a8277fa67af06663af958/76480324519.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=solucionario+matem%C3%A1ticas+aplicadas+a+las+ciencias+sociales+2+bachillerato+bru%C3%B1o+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_off0000dc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9A 11704 bytes
SHA-256: a50d61e943b613fdecd948a6fcf3de36715a5cfae6c78f25fae4e21d9e42222a
font_01_sfnt_off0000f773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF773 18444 bytes
SHA-256: b280aba75d637455d2e5f003eb94b1da585a1f404f7e92bfa6ccbfdada44a769
font_02_sfnt_off000125f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1