Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0066af5b47846b8…

MALICIOUS

PDF

90.5 KB Created: 2021-07-05 00:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 9c818aeb136ebfa049f6aba9e43692f0 SHA-1: 620e785eb3562f7ed6f0ec60246094a976876b14 SHA-256: f0066af5b47846b867c240cbbeb54c3f1316dc9c06221a8a2e55261df752bee4
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload storage and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cccf2fdcd---gebifuloxosewaken.pdf In PDF document text
    • https://cometsecurity.in/admin/userfiles/file/jasesivari.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/xipulijakirusumilik.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/7880134050.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160841736f23ef---6805791616.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/592832082118761d155694b50ee3ab56/78493915441.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/vazumapaludevupejuriz.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/29803177198.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/ridisujegekisila.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/gudasifedugu.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c954f04484---worekisikejebopin.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/6irljjbct2ffc7lsb5qsiivu11/woromonejixokerinigasuru.pdfIn PDF document text
    • http://hydrem.ru/images/file/41272999178.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/2rn4g0e3hkqi349u2bdvvt6i21/76406324353.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/mogifugufunosakozexaw.pdfIn PDF document text
    • http://drive4smilesquebec.ca/clients/f/f5/f58105ca183540932673f5bf18e62671/File/54428807730.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/33078610018.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/wokivibavujim.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073886e25ae3---lewusugubefefasen.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/1f940e11a3e038c2839987518d6671e1/1233519998.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///46811130888.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16073e0d880564---gomamiwiwefusigetibi.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/9bf9ac02ce2e46743cc7aed8783cfd66/64519257435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=misericordes+sicut+pater+meaningPDF 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_off0000fd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2C 10904 bytes
SHA-256: ccd54a632d638d11fbb3f7a5c452386367e36c83424ea26ba84a340fe7cb2b6f
font_01_sfnt_off0001163a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163A 17396 bytes
SHA-256: 9bab807e1120b66fbf84fc30a5eb7a4715f4a9a1f0720524ec68765d3ed8060e
font_02_sfnt_off000142f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1