Malicious PDF — malware analysis report

Static analysis result for SHA-256 999f8c719b0868bc…

MALICIOUS

PDF

78.1 KB Created: 2021-09-20 07:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7584078fca29826578274562cf79db70 SHA-1: c22f8c745292ea3de6a9c219da6e58926d7f31b6 SHA-256: 999f8c719b0868bcb69f6db78d6b2d2ccd10340c2bb15bc34e72418b4c4a46fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm with numerous external URIs, many pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further payloads. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://infrive.ru/uplcv?utm_term=cricket+game+apps+for+android PDF link annotation
    • http://meble-tk.pl/userfiles/file/23707398875.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/e1234f64744dcf34498c7635f4688c82/zexuvazuxagenematatalini.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/ligujoxakedetam.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///belukuvet.pdfIn PDF document text
    • http://thepducphat.com/upload/files/12799549010.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/48756299538.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/33571554439.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/93793709774.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/44919fe2cef0992a49d2561e8dee9ed0/34409789013.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16147c2a263e54---18673393771.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/51019794864.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/58495440952.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/56059027711.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/nolaforul.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/diker.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/munukaxubew.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/pelilesedijefagi.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/difekalujuviwosifiniv.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/567a893d7fb5ed6583c2dde3244e374b/xawazilekuzaxawafunuwufi.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/80222102763.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/237dfb9b0a171ce0f61f03ca4aa88653/petejadetemevaxatefo.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/85155360116.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/vexowiwobisaletogun.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_off0000ce4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE663 11040 bytes
SHA-256: 79e93803ac435f0080a3ad17a5dfb96a80cd9107b24e1c4fffbae7bd693af0f8
font_02_sfnt_off0000fff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF0 16708 bytes
SHA-256: ce8601957722723d216ef57ed33dcab4f5d4dbf21b2b8088f607e8dec53b192b

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