Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a4538f72979c4b9…

MALICIOUS

PDF

78.3 KB Created: 2021-09-24 23:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 33f4ed44d2395f95afc3a4227b6bd53b SHA-1: 11173c992dbf0b96b4fd0fbb21593a7819cd5561 SHA-256: 6a4538f72979c4b9579479862061dbb9529b4f8a3162e1cbfbe12ff92d0b9818
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. It contains numerous URLs, many pointing to compromised CMS uploads, suggesting it's designed to lead users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a large number of links on disposable hosting, likely for SEO poisoning or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://pistant.ru/uplcv?utm_term=telecharger+jeux+zuma+gratuit+pour+android PDF link annotation
    • https://bomando.bomsolar.com/uploadfiles/files/73926260118.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/wugopurodaxota.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/zajud.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/ihfbvdn7irn3b30hdcddnfdtp0/puzibotifufiguru.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/powopadoreg.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/75655391556.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ludope.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/27493029354.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161379725f41ae---wuvegarabajit.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/44819679281.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/97884687664.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/2856915121.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/54995669958.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/tuxoserever.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/57116495761.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16149c1ac52847---14262289397.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/77718093038.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/gopudukuwelonu.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/91283066511.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/21708929933.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/petaxipuw.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/53608645723.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/32462422636.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/34420597755.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB211 17528 bytes
SHA-256: 24d8931d339f0e2fe1420def17015fa1a3c873562960868d0d7a250f05852e11
font_01_sfnt_off0000df08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF08 11148 bytes
SHA-256: 0720be970bed0675ca9f0f7f0d6f86f3314a19f20f90151cf06fee246db00389
font_02_sfnt_off0000f8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000110cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CB 17348 bytes
SHA-256: 5fca8f53c509769c2f8f98dd6c52dfaa3f3da15db370019114b0d75cf5f6242b

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