Malicious PDF — malware analysis report

Static analysis result for SHA-256 221900107df9bdde…

MALICIOUS

PDF

77.5 KB Created: 2021-09-28 07:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 68e31864b675990ae4ba80a0236a3b33 SHA-1: e9b1567b027100bcfa545548d33531d2e55de192 SHA-256: 221900107df9bdde30f598e8821149069297f91691e3f3485f3068f486858d86
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or potentially malicious domains. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classifier results strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external URLs, which are used to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ae4404559---74464693839.pdf
    • https://octvads.site/js/ckfinder/userfiles/files/koresojulofikaxoxen.pdf
    • http://giustizianuova.it/userfiles/file/42238207606.pdf
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/tusuxoduzepukutora.pdf
    • https://crc.creativechange.net/ckfinder/userfiles/files/joninalupazotip.pdf
    • https://oldgradeducation.com/ckfinder/userfiles/files/bufosigafexunetiguboto.pdf
    • http://ageddfjtj.pretty-match.com/upload/files/4090896077.pdf
    • https://sanipro.ma/app/webroot/uploaderfiles/24541100575.pdf
    • http://aow.infogestnet.it/ckfinder/userfiles/files/35147925894.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137e99db46df---davarexotezosa.pdf
    • http://isdoor.ru/uploads/files/lusapuraw.pdf
    • http://kapalishakti.com/ckfinder/userfiles/files/38738767857.pdf
    • https://irisapp.cn/uploadfiles/fckeditor/20210925/file/16325704832902.pdf
    • http://asia-test.informacittadino.net/media/files/35428915172.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/fe8a483d4071f7041e060049aa802794/17528257066.pdf
    • http://dintainoodle.com/uploads/files/wugemobun.pdf
    • https://www.wemservice.com/ckfinder/userfiles/files/18875715325.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404d7a081ca---tofajagubarib.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfc8d58162---47992126579.pdf
    • https://ssmavidiyar.com/public/content-images/files/3792359094.pdf
    • http://kashima.cc/userfiles/file/14324276094.pdf
    • http://support-cmu.com/filedata/file/bevosideta.pdf
    • http://thepvunamduong.com/media/ftp/file/36182360895.pdf
    • http://stoka-saarlouis.de/userfiles/file/xivogopuvafive.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad8a1078ee---minorowijutebatobebekuz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=shareit+latest+version+download+apk
    • 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_off0000c71f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC71F 16792 bytes
font_01_sfnt_off0000df31.bin
6aec50294bb74b2e7e550fe3a70dfdcf80e59c0872a60da58e3c3d7af4964fca
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF31 18444 bytes
font_02_sfnt_off00010f93.bin
db75a3920dc49c34fa7df19edf967a241fc030f47b3515889f94629020598da5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F93 10808 bytes