Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8729a06add39d36…

MALICIOUS

PDF

78.8 KB Created: 2021-09-17 09:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1165521d6d2da6d1a6bc5d4b2c4709b1 SHA-1: 84ed14a48eb9c81701b46804f8287dbb175d2c66 SHA-256: d8729a06add39d36a368d48217bdc3250181424fc26fd36252982350fde17e6d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of 'utm_term' parameters in URLs suggest an attempt to manipulate search engine rankings or lure users with specific search terms, such as 'gangstar city apk mod'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing unwanted software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=gangstar+city+apk+mod
    • http://tincorner.vn/uploads/files/14330959701.pdf
    • http://bunny888.com/ckfinder/userfiles/files/dobudexivozofuvafukawu.pdf
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/59244617834.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16143c696e3d41---93213914780.pdf
    • http://hondasushi.com/uploads/files/4609593008.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/buuo5ngsin7lbua5bd12a9a64v/nelalupasokipalotiruzivef.pdf
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/kemoritumuxekexovakit.pdf
    • https://omprintandpack.com/userfiles/file/46913082398.pdf
    • http://matchonusa.com/uploads/files/pefugetibadefi.pdf
    • http://telegid.tv/userfiles/file/60440873114.pdf
    • http://movediary.com/userfiles/file/jojowekefisadekigewedoxi.pdf
    • http://k-sta.kr/FileData/ckfinder/files/20210906_B8567AF14813CF58.pdf
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/durekenunaloma.pdf
    • http://webbyshoe.com/fckeditor/userfiles/file/kewaz.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb328477c3---mokisejimevakitularo.pdf
    • https://hanyauntuktesting.com/contents/files/vupatipepojalivifuze.pdf
    • https://cfbadalona.net/ckdata/files/90066327726.pdf
    • https://implantsdentairesdesmoulins.com/upload/editor/file/56281747353.pdf
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210914150110.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16135b02fded6d---25874589950.pdf
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/88965101898.pdf
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26844071230.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecf8f514bb---63687164512.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d07d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD07D 16792 bytes
font_01_sfnt_off0000e894.bin
2543742207a32a0e8bfec3841e9c6e5b00294a23e5225bb6ce3e3d762e422f22
pdf-font-stream PDF embedded font (sfnt) at offset 0xE894 10924 bytes
font_02_sfnt_off000101c1.bin
a1004a0cb101640ef42164702eaee2a5f3584ed9e1456cedfb9bee1b6ea85293
pdf-font-stream PDF embedded font (sfnt) at offset 0x101C1 17236 bytes