Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae3d9d363f8fad85…

MALICIOUS

PDF

81.9 KB Created: 2021-09-12 15:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 55bf664f1ff3b4d104008f0a3f869cbd SHA-1: 80a900d49e23428a68d308e734ecf0184ff7018f SHA-256: ae3d9d363f8fad85853734e777b53c9db34a9f95f3c855332d3bedf134a59f24
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised or disposable hosting. These links are likely intended to redirect users to download malicious content, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.barbazan-debat.fr/ckfinder/userfiles/files/zuzilesilotamokoru.pdf
    • http://gowowdeli.com/uploads/files/gemikalivabuwafaxalus.pdf
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/buvitaxutetuzowebanepib.pdf
    • http://peach2560.xyz/js/ckfinder/userfiles/files/86944869510.pdf
    • http://isotope3.pm-ural.com/uploads/files/63672658750.pdf
    • http://farmandari-sarvestan.ir/images/news/files/rozubesuju.pdf
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/xefozapisivivarase.pdf
    • https://alternativecarrepair.nl/userfiles/file/87758892060.pdf
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/bijaxokizumapokiwop.pdf
    • https://domilot.com/uploader/files/63440807080.pdf
    • http://winfielddeli.com/ckfinder/userfiles/files/60712057926.pdf
    • https://begili.com/uploads/image/files/zopexelaribivewejotiwu.pdf
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/38216312005.pdf
    • http://dralituncer.net/userfiles/file/27809723089.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130851b05c6e---nibududawaxudogosoz.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/2c6mb3abgh917tideksft23rgo/lajuwafifugajeno.pdf
    • http://kco.su/userfiles/file/60625919761.pdf
    • https://godahoian.com/app/webroot/upload/files/8332311915.pdf
    • https://limblength-sldf.com/userfiles/file/28134947184.pdf
    • http://fpole.ru/sadm_files/mijobuzozujipebubumo.pdf
    • http://take114.kr/FileData/ckfinder/files/20210912_37F8F82B1DE03436.pdf
    • http://netisiletisim.com/guvennet/resimlerfiles/14531337155.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/1fcb7b3779c54d2d3267c04f269bb9a2/vesosinabedutezasokuwamu.pdf
    • http://carrasvilla.es/uploads/files/wifenobumajufi.pdf
    • http://amindoost.ir/images/upload/files/xilupuwofotufiwanenab.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=tetris+apk+no+ads
    • 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_off0000d833.bin
2f232028ceb0ecd97d50705f03c9a79a23c83b6b6cb1f25b79249a23e59c4354
pdf-font-stream PDF embedded font (sfnt) at offset 0xD833 18500 bytes
font_01_sfnt_off00010896.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10896 16792 bytes
font_02_sfnt_off000120ad.bin
0bf3d17df5bdbff5c6d0a7e14fb5be45cd95b8a61f61a37c938deeb916f2ccfb
pdf-font-stream PDF embedded font (sfnt) at offset 0x120AD 10396 bytes