Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f63da81174e3e8…

MALICIOUS

PDF

82.2 KB Created: 2021-09-02 01:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 111a2728d2607fcdef0b441a525b7c24 SHA-1: 5414a02daab67e56cd2fd47572bce1c9c5dd969b SHA-256: b8f63da81174e3e8703dfcc0b396bee668094cae0ac9b4ac7a472746b71cc507
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on potentially untrusted domains. The embedded JavaScript likely facilitates the redirection or further malicious activity initiated by visiting these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://huntic.ru/uplcv?utm_term=the+texorcist+game PDF link annotation
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/j1l5qlr22n8rnkkhq4epfc8gjj/lufikinonaxoben.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/domoku.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/bhh2nu6k2snt3o2p5dut1v5l94/nevopuj.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/57599867317.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/ee8991d265294a31560c668ad11d64d3/lozebepipupogirege.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/23018137009.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c92a83a1f34---8089770033.pdfIn PDF document text
    • http://canadianrockies.info/files/file/7250338688.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/7b0753b42af02a547909688351d6e796/99572092615.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/94176159537.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb8d2af5aa---7953625177.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/74348919017.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713e70562f6---84130492983.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/39001506127.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/dadovemijukaxunajimop.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/cb7hegc1uqe6a6h7rioougs062/18084641496.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c011f8a5e4a---jerojijitumumu.pdfIn PDF document text
    • http://thomasbelldescendants.com/clients/40432/File/jajegopon.pdfIn PDF document text
    • http://bkbflooringusa.com/userfile/abbey/file/nudujakuwibiruferajil.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/balisexonaluzevusep.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/veferibusejimozejesibos.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43323104036.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4c7903120---65331288784.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/sosuvusox.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/fojabomadizugiduvigimof.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/mimulujixitafa.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-12/20210512143601701353.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_off0000dc0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0B 18136 bytes
SHA-256: e325e5eca5dc08fc52e074c10584776edb26d4690e84621b4514e15b1db1a6f7
font_01_sfnt_off00010b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12361 10592 bytes
SHA-256: fb09ac84159818a46ddbf4fdb82184fe26fdb2189b2e021b9921e867bc5f30af