Malicious PDF — malware analysis report

Static analysis result for SHA-256 c326d3aac71c65bf…

MALICIOUS

PDF

104.4 KB Created: 2021-08-09 09:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 80566ef875b8217b97e1f5fad8ed76e8 SHA-1: 02374e901352357140abdb75bff905d3b9ecab3b SHA-256: c326d3aac71c65bf5d4a098b1502428c345d4abb9dedc7d02355c2f0345f176a
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

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://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/0d2f62113ce307966fa688e8b9bc5193/63872371004.pdf In PDF document text
    • https://rmp-familienanzeigen.de/cms/files/3867708656.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/7j8e7doevsutbo9geplhtcobj8/79262934922.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/kuwogetukuzekufanutoxis.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2459632079---96026635575.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/92dfde0eccdc60bfc6e5217804062491/gejurob.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160877d38c0129---508240505.pdfIn PDF document text
    • http://srlamn.com/clients/0/00/00e84243199fd86ca7c15d66a0237eb0/File/berejekulepepoke.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/6595334511.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/xubiroroluga.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/85f430fa8ac84358996273a236c042a1/98463352563.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a83d868f09c---pemanarikapa.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/99051821198.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/27971536301.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/40807589754.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/wutatupu.pdfIn PDF document text
    • http://gyobel.it/public/file/21056880878.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928afeb540b---30773545679.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/xevowijaxaluweximebiza.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/suxulebatukavakum.pdfIn PDF document text
    • https://carlojans.com/cms/file/18926351571.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/ec1e3623affe93b999da7dc1f7b94570/zutedubidesukovemiro.pdfIn PDF document text
    • http://abroadster.com/files/lumativasegobafepeb.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccefd9191d---92027570678.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160970b66e5247---15219989001.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/buximisotimobodunusubate.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/1446499420.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+much+does+a+kfc+franchise+owner+make+in+indiaPDF 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_off00013189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13189 10868 bytes
SHA-256: 80a86c46f4f521e2a17a9ec443bcfcc2f677154d13edc2244fa0f38192644e03
font_01_sfnt_off00014a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16291 18700 bytes
SHA-256: 3a96953bd55663249c2060e0130ce56cbf86a9d0bccc52e7f7dbc07c464fe6de