Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3d9a7f7abb6ced4…

MALICIOUS

PDF

71.3 KB Created: 2021-09-18 18:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 94112274b247f9ad95738d46d06c0235 SHA-1: 0648589a7ba977200a42793439683d8b660e6914 SHA-256: a3d9a7f7abb6ced4ee3a2b69ee27d9a0adc256ff18693d704395f90e292e81d3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these compromised sites. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://tageedesign.com/ssmpt/documents/file/bivaxitiwosifose.pdf In PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/161302e3b15edf---31940506941.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/xijejutukoxole.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/vafuwudexom.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/75784383792.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16140938a72973---11434144707.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/62925180164.pdfIn PDF document text
    • https://clickbox.ro/images/file/77725751611.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/34799351447.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/14963081630.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/96987959101.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/60508935857.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/c6f02de92db9ca016de16738cb359828/rasafekololi.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/58984753466.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021090316010980554.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/98894624057.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/16881076377.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c26fa2c29---88255721122.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/jizireluj.pdfIn PDF document text
    • http://riviera.az/userfiles/file/rumagiz.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/vowijajekarikimax.pdfIn PDF document text
    • http://etkenkalip.com/files/69968627410.pdfIn PDF document text
    • http://www.andreapondika.cz/file/zamopofibonar.pdfIn PDF document text
    • https://alev.az/userfiles/file/85460329004.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=hack+free+netPDF 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_off0000b81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB81C 16412 bytes
SHA-256: eeb72f4424870d71e817e74c99f3b6a26080eeeb05c3f376297c4d1266e897b7
font_01_sfnt_off0000e231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE231 9984 bytes
SHA-256: 4299d71e6c26f5dc9a51d08ab2ade0ed1f2b8d5aab641299869d693627b1c364
font_02_sfnt_off0000f870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF870 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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