Malicious PDF — malware analysis report

Static analysis result for SHA-256 32f9f85f7c5225e6…

MALICIOUS

PDF

86.6 KB Created: 2021-09-18 19:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9333560e169b30ee2a4fa48c1f6a63b6 SHA-1: de2a1ec5f0d536a0bec6ceb077f3e80994c3cab5 SHA-256: 32f9f85f7c5225e6654c83515cd8486d50dead48bdbcf5070d19993e4da91a38
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://diversecityuk.com/userfiles/file/92679706847.pdf
    • http://dalnoboy.org/data/filestorage/upload/files/nipusibevosukotog.pdf
    • http://immobilieninvestors.org/userfiles/file/65264060130.pdf
    • https://kingwrapcarspa.com/upload/files/lixikixuvixegaputinoviki.pdf
    • https://halkum.rs/files/82412934249.pdf
    • http://climtech.com/files/files/90610998615.pdf
    • http://globalroomplus.com/bot/ckfinder/uf/files/fatimokugomugakegivi.pdf
    • http://maivietnamesecotati.com/uploads/files/mukulotivomivevidivenixed.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614090ede7a35---vumizabodoxukidubavobuge.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161438088e1ebc---74791089802.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136c202d5c17---jaxedawozobafamorubedu.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/d2bg49ctt2gv2pq2dlpkud7510/biwajanigi.pdf
    • http://thucphamchucnangmy.vn/uploads/files/tinepaxexitesejonif.pdf
    • https://highlander-inn.com/assets/userfiles/files/72169267361.pdf
    • https://vnjhanoi.com/upload/files/fuxovufajolokod.pdf
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/wapibujizejatex.pdf
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/pupemetux.pdf
    • http://sahamit.net/userfiles/file/1974503988.pdf
    • http://abwrichmond.com/uploads/files/ropegufokuxexefagi.pdf
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/wupizikumurimudanasola.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138db6907158---lorudekagopaboxuradi.pdf
    • https://mimpiindah168.com/contents/files/25371135776.pdf
    • http://ebrinteractive.com/userfiles/file/puwolozidevuwiruravop.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=caller+theme+app+download
    • 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_off0000ecec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECEC 16792 bytes
font_01_sfnt_off000104fe.bin
c3b9c8cdee3dc771e9653f6289db2509d25314a5948f3077ed8c917ee4f6e0b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x104FE 18236 bytes
font_02_sfnt_off00013472.bin
f76a195fe3f48276d6cb99886fd9aa9a07477f84c4e6d8fa95dbf0d2f5a03012
pdf-font-stream PDF embedded font (sfnt) at offset 0x13472 10512 bytes