Malicious PDF — malware analysis report

Static analysis result for SHA-256 2448dc9c7d07274b…

MALICIOUS

PDF

101.9 KB Created: 2021-07-27 22:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 04153fc39a554adebcf14ac23f391d3f SHA-1: 803f64969da2506236c6304b19e99e0d612f0251 SHA-256: 2448dc9c7d07274b4ed21b8d09a5d54c6d06b1f31b77139271c4567d8c636f84
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of links pointing to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on such hosting, likely for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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://plswa.com/wp-content/plugins/super-forms/uploads/php/files/4f234c66f0788bef8d6d6a9dfb4c639c/35280189221.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed9953df661---zilugedotuxefox.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/e60f6c688924b7fe2659833d10ea717a/53381470073.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/4eef4646d372cd0478575577b70b5a3c/48933482652.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/ec982966f5e59401dc8e20620ffcbdc4/zogatodalimon.pdf
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/jimumasasakulomiz.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/9fe61d01d950ed98c76a7a235a6ba3f6/73911547755.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f373f100e---46121551971.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160869594bd0e2---jixewurotudojedepez.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609231d852702---37124091713.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c03a967aa---bafoge.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/ha2smpu50t4g255hkcoi6b1jj7/mejagosofaloden.pdf
    • https://cr2tek.com/userfiles/Proj_Name//files/70660880833.pdf
    • https://dm288.rs/slicice/file/derojipexurowezutidafap.pdf
    • https://adsbudget.net/userfiles/file/zediwewodovutu.pdf
    • https://vettercycles.ch/userfiles/files/70027602275.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6f01ea0b5---56699332111.pdf
    • http://fotossc.pl/_files/file/27666575464.pdf
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/padetuzewimitamiw.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b38d788139---27724290573.pdf
    • http://thunderstar.cn/userfiles/file/20210518210841274976790.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/c1b8308054db8f5b4440b35eed6a790e/42968082237.pdf
    • https://camping-du-lac-dijon.com/fichiers/lidujeresodome.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/5c93fe1405d739ff675fdb382867a144/64045010882.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ad21bdb6b---69169595926.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=cours+math+5eme+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001124c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1124C 16792 bytes
font_01_sfnt_off00012a5e.bin
017cf7a7d62718ce9e849b62847ea9ab309905164630455c2a558f707a84e5ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5E 19432 bytes
font_02_sfnt_off00015b5c.bin
6b54a3f50d1a413a5c8c0ed289a9c866e37e8bd73df0b162fe7132700ce54c18
pdf-font-stream PDF embedded font (sfnt) at offset 0x15B5C 16100 bytes
font_03_sfnt_off0001709f.bin
dd1cb1f69eb51203eb2d383455dd896ccb9db6b6d0433a4912abf4bbda722760
pdf-font-stream PDF embedded font (sfnt) at offset 0x1709F 10788 bytes