Malicious PDF — malware analysis report

Static analysis result for SHA-256 c02fc0088f41c37b…

MALICIOUS

PDF

96.0 KB Created: 2021-09-07 07:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2d66a8e75e43b45c5386cfe391214bf3 SHA-1: 9306d55444325064b5e2e1627f6f34b755975bcd SHA-256: c02fc0088f41c37bf6b8a37930a2338e289f4fb39a75a4d12c9b321389ed9ab2
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm or phishing lure. The document body is heavily obfuscated and unreadable, preventing a deeper analysis of its specific intent beyond directing users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

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://hatinhjobs.com/upload/files/95949961872.pdf In PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160be17a6cf173---12528049225.pdfIn PDF document text
    • https://appfacile.it/file/belevokezusukefazidiwepex.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ritataxasu.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/mepebitabanitiw.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814744714d4---7608485187.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/1fbabb4adea5abb4ff9059edd7069b18/39623471002.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/68815282562.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/tiwazevosini.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/luselizug.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/c541a262b55cec649d994f5761c3c644/56738587708.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/65695d10a8b36c68f1446f65a9c53a82/96834482802.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/d8c069fc97cdf53dbb8fb4ca2d1b14aa/43872488652.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16094bd9f2989b---42955858018.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/nikogapisekasuronojokab.pdfIn PDF document text
    • https://marijina-romarska-pot.si/userfiles/file/27277216997.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/besuwumaboru.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/11449973465.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-6-13/20210613224628331519.pdfIn PDF document text
    • https://istanajp.com/contents//files/55252204251.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210603_57916BBCCF4A3A77.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be92b93714e---gonikagiresetujakudi.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/51f350189f791780328ad5cf9bf1d53d/86451360888.pdfIn PDF document text
    • https://isleo.com/i_photos/file/delefudilisuburavapesomit.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/wijovaranusulutedalolak.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/3fb8d493e6d9030d6081548469f4544e/50146405689.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/hkovg0gkvpejs7i8vifpe9l2b0/fifutijiliwodekowipuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=alstom+logo+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_off00011013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11013 19604 bytes
SHA-256: 409af5d86d80a8c851f4bdab380c86aabfb83ad0b42a97062aea3dd14e3e8787
font_01_sfnt_off00014364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14364 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B7B 10232 bytes
SHA-256: 6ee13dc958a9f68b44db8419722faad8ead2ecdcb5c6ca7a41a5a6b2ce7a85d6