Malicious PDF — malware analysis report

Static analysis result for SHA-256 27e2d5d8dae9405b…

MALICIOUS

PDF

82.4 KB Created: 2021-08-15 13:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 94ba9867f959ec566794dd720cefc938 SHA-1: b54e8ddc1eda5caef6987cb31bcb4813ce01465d SHA-256: 27e2d5d8dae9405bb7d6b92a75392173cd33fa7fa15155c75885d2710f61e967
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document functions as a link farm on disposable hosting, suggesting an attempt to direct users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d6a1b482b---roparekajos.pdf In PDF document text
    • http://rydelko.pl/userfiles/file/99977281424.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/palivubikomidujim.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/6f42d2c8b9badb1a220ad8c27fd4acc2/lukepekobadukezore.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/3u2pcjll8tf2mmktdb8v9fk7c1/47007832736.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/12430262384.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/nomibosedemibuvi.pdfIn PDF document text
    • http://huiking.cn/uploads/file/261927101350.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fea0ad0326---mumokisatapevonuviloridar.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/lusexowosulofuvapelopo.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/femomakekufami.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/rorimiv.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/45423108568.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c28f265ee7ee5aa1f2b5423a61b8d55b/510801313.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1efd00b7f---10887835547.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16102f90abeec6---divuvuvi.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/30403631444.pdfIn PDF document text
    • http://sparkpro.lv/content/file/2334142562.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/ratedalifagor.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb9e55e512---vanuzuredi.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/2q57r480ocn9k0i713isa593o1/jazewexirulixaxupe.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/19011c1ce78150bbba9a9515564aa719/96095870301.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/15tovletmhep88lf6euhki3ql4/98211336009.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=barbie+dolphin+magic+full+movie+in+english+downloadPDF link annotation
    • 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_off0000dd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4B 16868 bytes
SHA-256: a281b77ea4376cc5d1850c6dc09a09a15573becb09a3cf5671be5432ba9e28f0
font_01_sfnt_off000108ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12116 11416 bytes
SHA-256: cf4ead59d636fc0798bc8454461597b72a058dc1079b42c9ea65f877ab24abc6