Malicious PDF — malware analysis report

Static analysis result for SHA-256 d99ff0a2d0437775…

MALICIOUS

PDF

75.0 KB Created: 2021-09-03 00:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cbed596baab4407d9a271b68133dac20 SHA-1: f46406c6f1e4b70f809f3a2155c573d007543341 SHA-256: d99ff0a2d0437775e3ad4a4595cfb9475b9b15abc9cceca85170e6dcf629150b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, with numerous embedded URLs pointing to various websites, many of which appear to be compromised CMS uploads. These links likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nomylo.ru/uplcv?utm_term=dislipidemia+que+es+pdf PDF link annotation
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/tqb7b22okit0lro92bghckss7p/45620283006.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/jupuzidisofodetixigugaz.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/pibalopezilulapi.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc8bc28430---teruxokisugifisidep.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078abbce76e0---kumakidufoxusakijuja.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/a3f34de33ea98738d403c6bc87f5eab1/32760703742.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/ravokitujenodetenedi.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/58559822071.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/vupazozanepa.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c07002af87---jetobinixapizakat.pdfIn PDF document text
    • https://eternalbliss.net/file/19916925443.pdfIn PDF document text
    • http://markone-tools.com/upload/files/17592800228.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1a86246301d0f941856e5c218c2853af/migukikaxovifu.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/36282354988.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/dofusosebob.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/gijcul4up4f66h427t8a5q08d0/46239237121.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acaaf8d3761---88866153491.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/luvikof.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16096428ba063c---latelusubijexufirokafuzu.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/eh4179h9bvil0pv8l8vatrvla9/kanuliwemoze.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/5992867822.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/92466469047.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/4saf2jo2m516lcu31dfjjf3oji/99965127107.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa71e0ba3---17327831705.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_off0000c332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC332 10484 bytes
SHA-256: 677fcbae391cb6b106fe140662d261d3963302a73aba9017d5738036b90e57b8
font_01_sfnt_off0000dac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D8 17432 bytes
SHA-256: 07c4bd5b5755831673851a6e5902c0177fda59ca20f47c9e71998fd274b17d3d

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