Malicious PDF — malware analysis report

Static analysis result for SHA-256 558274bd4900c77a…

MALICIOUS

PDF

99.4 KB Created: 2021-10-07 02:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a63daf7cab0506f4a3b43f98241b1377 SHA-1: 14e065e8227dc7b2ae511878d234fae255408abd SHA-256: 558274bd4900c77aaa898797aa2048a87353fc0183e84ad4dc6fb32ad9ce0e60
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, which is often used to initiate malicious actions. The document also functions as a link farm, directing users to various compromised websites and potentially malicious downloads, as indicated by the numerous URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=gate+chemistry+books+download+free PDF link annotation
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16149478380b0c---zowefupusajiwukisuvometul.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/gulipetixetuwororugili.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16133c55891141---70431240574.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/52032274836.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/1615167935.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/dikezeroro.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/xolelojejuxuwasew.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152b03295cd8---jogaderewiseb.pdfIn PDF document text
    • http://maaramachandifpo.com/admin/userfiles/file/misagenikukakixoderido.pdfIn PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/lorivitofupunoteneka.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/68215391574.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/kurasozawiza.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/natufabotunibedu.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/rezekewamomanemel.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/76516517046.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/93935534056.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/97542636244.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/5256568994.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/wigolejelilizelukad.pdfIn PDF document text
    • http://fygl.net/uploads/file/07160830515.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/8d3e358762058a7a2b8718b25b216a25/wuxibemuwefiba.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-1/20210901210131679353.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/rikasujemomev.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/fomijizaja.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/954j9j9trqo1pot5btlrt8f412/rikujabemabibupexonese.pdfIn PDF document text
    • http://benetalent.com/upload/files/74088241880.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001165b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E72 11212 bytes
SHA-256: ba21c9a10e7a831a6e0e0a150ccb5c1474ce049cb4c9e444521be3805ad874a3
font_02_sfnt_off00014895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14895 21268 bytes
SHA-256: 494636cc1e8f95277d263b08f6273fb70c77fe6acc7eabb3ae9784d9d4e1a233

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