Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3de98757a322177…

MALICIOUS

PDF

89.7 KB Created: 2021-06-29 12:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff51b0accfebf7688d1562c5d7a3a1af SHA-1: d028834300176379607cd6cd00591cc8c30bb466 SHA-256: e3de98757a322177689695d234a7892a387c7c50e9fae2c818ca6e14f8ade966
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites or exploit vulnerabilities. The heuristics indicate it functions as a link farm, pointing to multiple domains, some of which are hosted on compromised CMS uploads. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://eobliecky.sk/userfiles/file/3846057956.pdf
    • http://soflocops.net/clients/81266/File/mulojibivejewaduvazinujiv.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cafd20651---falorova.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/8fb352728b8a135137f686aa8808d192/zurukokaja.pdf
    • http://webatnet.de/ckfinder/userfiles/files/61703507706.pdf
    • http://stavclearing.ru/upload/files/9596363482.pdf
    • https://morabia.fi/images/file/xezimoluban.pdf
    • http://technoauto.jp/js/upload/files/14859267709.pdf
    • https://stratasphere.online/userfiles/file/zakinoxupisezabawovof.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a2bd41733---59271100472.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0316685b4---dovugiviwewufabakerabivol.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1f178e158---mijavakapuwesitavipozoto.pdf
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/5c4d8beb37b1e9bbfa432899d3387150/vitapumoliruwopunarete.pdf
    • http://shinies.ru/img/lib/file/kenejamorisewipol.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9af4a4811---ropobi.pdf
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/wedawiropewavekolata.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b678b92ea---mimonovix.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095bc1827c6e---34117158961.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/a48649aea32feeeb1567bb55e8724163/59535585373.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5f2f21b75---kebev.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/58728f43205a2265c6209c194509bef9/xokisejolenafem.pdf
    • http://mg001.cn/upload_fck/file/2021-6-10/20210610013002614242.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+make+short+hair+grow+faster+overnight
    • 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_off0000fa3a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3A 16792 bytes
font_01_sfnt_off00011251.bin
bbac76a01a065dfbe3978adf01d94ffa6133376a2bbdfb18d20d238854ea366a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11251 10852 bytes
font_02_sfnt_off00012b3a.bin
fa0a08c2038419578b468cda0245e81779e82875516b88b0f7968ab6acc60efd
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3A 17828 bytes