Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc1b87206fb98c6d…

MALICIOUS

PDF

83.8 KB Created: 2021-09-20 19:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e4576c4ec5b9dbaad2f34e9b17079445 SHA-1: 10fe0d200aaa4f3c57d9ce7cf5528499fbfaff04 SHA-256: dc1b87206fb98c6dd9d259b612c343e642b7c5f6c867f8486bcb7ac5719e4115
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and a link farm on compromised CMS upload storage indicates an attempt to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://www.hgbehringer.de/img/files/files/lopexajaxakodojasonozafi.pdf In PDF document text
    • http://haiannweb.com/uploads/files/fobisamaniwe.pdfIn PDF document text
    • http://ktcz.eu/files/files/89622092977.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/6d7a4b7cef876de3a914e3f2757e8f71/kidagovujilibijibotudovi.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/90922092727.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/baligi.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/45215984973.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/66538988347.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/nugavemi.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/6f58c08a6b2799deede6127171dfed86/41308324249.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/kugelijibibamawofotobadok.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/gaxirapabutilesifu.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdcb7ca001---danupujubutebexuluzomeb.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/vojiribumozonixemaliserum.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/pogegusitotutodaru.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614173f2263fc---75441396434.pdfIn PDF document text
    • http://home-plast.ru/foto/files/gedufokivodukav.pdfIn PDF document text
    • http://coolbiotech.com/upload/files/29973930802.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/kijigivetexufesozim.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021091015280880652.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/ridotidodupaxakotazutapar.pdfIn PDF document text
    • http://trieuduong.com/images/Download/laxiti.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b94d05bc54---96119799433.pdfIn PDF document text
    • https://partetesal.ir/data/file/mujeb.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/43799652590.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210909123131.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=pdf+file+on+phonePDF 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_off0000e4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0B 18152 bytes
SHA-256: 2db39aa147b96c27854d7759ddb96e05b0f60bc4efe8b4ec77fbc5ccc17cce44
font_02_sfnt_off00012b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7F 10068 bytes
SHA-256: 4eea26eb3e45ce0d4ca6865f567d8ecf2da6accd24736b6986ee5496c071ef43