Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa6efd0a25a0b28…

MALICIOUS

PDF

86.8 KB Created: 2021-09-04 22:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 93238b66984a235abe9179db725bf825 SHA-1: 5fe5ce3d68d03e58d9602809f9c145d2101f2780 SHA-256: 9fa6efd0a25a0b286bdcbf75499272f833df0f9d2d9cd79ca67e71feeff33bc2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of PRC/3D content and duplicate object bodies are also suspicious indicators. While no scripts were explicitly extracted, the overall structure and URL distribution suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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://first-group.kr/ckupload/files/kijunulona.pdf In PDF document text
    • https://best-label.com/upload/files/23183266665.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/tapumapiv.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202108190107098124.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/nabenozewapa.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/754f4b0a747ae5654a325ae0bc97f36c/bazujafodigikudejis.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/01239dc38df2d3077a2ac6b6dc5b84d9/tesexakot.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4f4ce8a61---58482020619.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/zorokazemuzivapafam.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cfcdda1185b---47678732882.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/d8ek4t7146hgq29d09bt95k1ng/90414990186.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/48406602126.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/jevixepivepurapopituxe.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a44c6936786---13629393740.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609af6c975b3a---xetagadivufeb.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/6539223133.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/98643683232.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/57211690385.pdfIn PDF document text
    • https://magatek.com/documents/file/59955651153.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/kepisowawebubizeja.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d5e5d0a75e3---19408008911.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/wimuk.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/dadifik.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160ad43bccadfc---gegisofibalepi.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/95570800915.pdfIn PDF document text
    • http://1976ahhs.com/clients/32223/File/disagimitozuxubofova.pdfIn PDF document text
    • https://afayl.com/userfiles/file/koneniwudasub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=daily+reading+comprehension+pdf+grade+3PDF 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_off0000f14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14A 11256 bytes
SHA-256: 36d28e7ef751ac23c57983bb56cffeec1c616e20647c241af2ad8b7a6af3743d
font_01_sfnt_off00010b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B41 16324 bytes
SHA-256: 4837ed582d4bbba7f0de7b510cb1e845f9fec081fe3cb3cba65ab4f67f5e0f7d
font_02_sfnt_off00013564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13564 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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