Malicious PDF — malware analysis report

Static analysis result for SHA-256 a00d2dea1bf352d3…

MALICIOUS

PDF

85.0 KB Created: 2021-09-15 09:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 139f22ff44262ab0e163d67b2e92ca4a SHA-1: 703e56d2586cb8d77174405e70a55e3c28764a09 SHA-256: a00d2dea1bf352d3c25326d78ecacd86eda2171a62feba16bfaf46d86fff2d03
104 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 ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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://laborke.ru/uplcv?utm_term=the+last+house+on+the+left+full+movie+watch+online PDF link annotation
    • https://eastmanllc.net/ckfinder/userfiles/files/wezigo.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/xeguginunenutojubifezu.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/wapipilupegunapom.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/tijewod.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/68366164738.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/bavipiwinaxam.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/55996277699.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/50770286318.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/66168717282.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/10962634184.pdfIn PDF document text
    • http://devveb.net/userfiles/file/busos.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416cb64fa08---45809635755.pdfIn PDF document text
    • https://geloracinta.com/contents/files/zokuxer.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/202195101436147.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/37621433516.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/10630395894.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/losotezewijepopikagafi.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/874128794.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/86261744409.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/83419471897.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/35878885812.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161410e6990d92---46261859163.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/zerofasojamemujev.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/mujadazuxizil.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/7isee5grovmc5jqe28fr672vae/tonejejedowadubadib.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_off0000e8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FA 16972 bytes
SHA-256: 7bd5556f160e4bf64dd18e644d74372cd41aafc536ae67a183689337b829072d
font_01_sfnt_off00011533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11533 10716 bytes
SHA-256: 2d9c8414bb395de533af5f03c26a689b17fdb90d1bfe5d6ea895250dab4e1c43
font_02_sfnt_off00012dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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