Malicious PDF — malware analysis report

Static analysis result for SHA-256 196c1e82f4fdab6a…

MALICIOUS

PDF

82.1 KB Created: 2021-09-20 07:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84dd4ff6043e333fe04ba440c88c6746 SHA-1: 9649a372eff4fe38e589501176ec966213babf45 SHA-256: 196c1e82f4fdab6a5cda257c51a14c66666fbf5f6246b08fe33808aa0f6c6147
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm used for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://globalcircle.club/userfiles/file/rixop.pdf
    • http://hanifeugur.com/image/files/kejokexudabuzoxedepovade.pdf
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/valesuxuvu.pdf
    • http://gasthaus-steinkirchen.de/img/editor/file/panemux.pdf
    • https://piphoto.tw/uploads/files/202109032223431602.pdf
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/jofipadijamebagesupufor.pdf
    • https://bjjewels.net/nbloom/fckuploads/file/figifolikonasilupelorad.pdf
    • http://soft-pro.hr/upload/datoteke/xuwifobozubasilaresez.pdf
    • https://habrit.tw/ckfinder/userfiles/files/girogidiguwaki.pdf
    • http://aygroupmuh.com/image/files/bozajose.pdf
    • http://www.zywawiara.pl/pliki/90367920316.pdf
    • https://alixdemassy.fr/userfiles/file/65427463033.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161456bfc556e4---wupojatiwodo.pdf
    • http://st-communications.com/ckfinder/userfiles/files/varumediv.pdf
    • https://campermagazine.tv/public/file/munuwubodol.pdf
    • http://ipai-bg.eu/img/file/80625136876.pdf
    • https://broadcasthub.com/ci/userfiles/files/gekiverovo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142292fceae3---dosarelob.pdf
    • https://elearning-chemistry.ro/userfiles/file/wekojozularakidila.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d52d38508---taxatupi.pdf
    • http://drumlockingclamp.com/FCK_Editor_Images/files/52615776493.pdf
    • https://volgogradexpo.ru/ckfinder/userfiles/files/79549742972.pdf
    • http://ecme.site/2015/vat/upload/files/32962760424.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351bfa2bc26---fexape.pdf
    • http://xhiehchin.com/Xhieh_News/_file/32752337345.pdf
    • https://cliniquemyo.com/userfiles/file/lonatuxomobuw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=demon+slayer+movie+watch+online+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd46.bin
2ec862358c4e57785d421bc21ae92430f69c0cc8587006272d79de6e83a096b6
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD46 10868 bytes
font_01_sfnt_off0000f644.bin
9a62d08a5a9d211b3924445054d73544cb134a92c0cc162cde03a9c4cd9c67ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xF644 17040 bytes
font_02_sfnt_off0001224e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1224E 16792 bytes