Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c5bb4dd1df5d664…

MALICIOUS

PDF

71.2 KB Created: 2021-09-13 00:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2ed0167dee932393e9705fcd139fd2af SHA-1: 92012bd51ce2b708f95fceee9d55f8606a0a69cd SHA-256: 6c5bb4dd1df5d6649d3fcc79ce9b0729579a292da62b6d7e4f420a154c1fc258
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm for SEO manipulation or to host further malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and the presence of embedded URLs suggests an attempt to redirect users to potentially harmful sites. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3748

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://phuquytravel.com/nguyenvanlinh/files/fezuwivugofi.pdf In PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/polozojomafalekinuf.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/42338146090.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/wukipadomokelaxuvogigebu.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/f600fd096cb202965a51f976e0b3803f/7242161385.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109110412293495.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/modukipalomaxemibudala.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/bazojuzosemo.pdfIn PDF document text
    • https://euchebnici.com/img/file/18580213841.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/30413904316.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16136a639c340d---44854834834.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/1581ad322ef2d26f7dc499333ac7a0af/37229154080.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161356ef91c872---gidanuvogitubudeb.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/2790eb3cbbaf9f9af97076e61d8424e1/42938931463.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/d4f2f48350c87c637b9e26a43a652641/jabitimodat.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210911022018.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021090610005111.pdfIn PDF document text
    • http://apple888.vn/luutru/files/19393391231.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/29190345498.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/e790196fdbc63ac528beca94e7fcda3c/tarekujedesonades.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0a207d01a---mixutotogo.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/77292756329.pdfIn PDF document text
    • http://ewtch.com/upload/files/76700141855.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/bivefebosekan.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/14630683183.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=racing+games+pc+free+download+windows+7PDF link annotation
    • 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_off0000bf1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1E 16508 bytes
SHA-256: 24235d4fd718be2fff18e30905ef373b9602162d37add7bc5f0b9ff688692bbf
font_01_sfnt_off0000e98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98F 11044 bytes
SHA-256: daf556a1ffa1d4f54956f433fa3f66836fa0d430a132fec1250662bfa891f588
font_02_sfnt_off00010321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10321 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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