Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16e25749f8f583c…

MALICIOUS

PDF

147.7 KB Created: 2021-09-08 16:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f55c951b6dd50f1ae8daf37a59af010 SHA-1: 7f8c12d786f88a800fb36742b75153b86d271398 SHA-256: c16e25749f8f583cb2a4238088b8e2ad125cd5b312d207e4d5d55743168a25ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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.
  • 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.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f95774f340---80091297025.pdf
    • http://ordineveterinarivenezia.eu/userfiles/files/28653062469.pdf
    • http://rentaruedas.com/files/others/wewexa.pdf
    • http://arabic.cz/ckfinder/userfiles/files/3320689457.pdf
    • http://fashioneducation.ru/userfiles/file/leniguwexebovofa.pdf
    • http://dellalontra.it/userfiles/files/24949462655.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355a636d5ef---pisexufeje.pdf
    • http://budohurtsa.pl/userfiles/file/tanevuvegeregomu.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387d5347726---40062541944.pdf
    • https://zegaoyun.com/calisma2/files/uploads/22071748353.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/444eb9bd71df442ac3d167fb1d689199/78750808481.pdf
    • http://diskacme.dk/images/upload/file/822053226.pdf
    • http://eternaseguros.net/files/files/39623653351.pdf
    • http://china-miyaco.com/img/file/20219213525.pdf
    • https://eguiders.com/uploads/tukomarel.pdf
    • https://dancleland.com/img/upload/file/22968804648.pdf
    • https://theurbanthinktank.com/files/29757735071.pdf
    • http://insuralead.com/userfiles/file/33911127876.pdf
    • https://ateliersmq.com/pevron/www/img/file/xebexusuwekutujexegibiraz.pdf
    • http://dija.lv/public/userfiles/file/kuvelinukekopusirixaxit.pdf
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/vabaxuzamepudaki.pdf
    • http://yushendesign.com/images_fck/file/1630736985.pdf
    • http://rudolphalexander.com/uploads/files/lirulopojogofokudalojoz.pdf
    • https://westhygiene.hu/editor_up/potizugotorabop.pdf
    • https://masukpt1.com/contents/files/54983393815.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=stolen+dance+piano+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d82a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D82A 16792 bytes
font_01_sfnt_off0001f041.bin
ade764591ce18b3b8a99879545f0637024c29097e163c6449a18424cedf3503d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F041 10420 bytes
font_02_sfnt_off000207f5.bin
2ff167de3fa472c7ebd49d649340204ebaf387e6e22340658dad4d4db3764900
pdf-font-stream PDF embedded font (sfnt) at offset 0x207F5 21748 bytes