Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c9d9195995648fb…

MALICIOUS

PDF

76.4 KB Created: 2021-09-16 16:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d2c435337562802b4d97bb50eb2a6daf SHA-1: 579d08b0474df9ff8ccf3d5505f0c8e116115a0d SHA-256: 7c9d9195995648fb387ad52af43e2dd64971c5b6772c324b050997a074a96321
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to external content. The presence of 'utm_term=amazing spider man 2 apk download for android' in one URL indicates a lure for potentially unwanted software. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://hospvetcentral.pt/site/upload/file/74729600293.pdf In PDF document text
    • http://www.hgbehringer.de/img/files/files/kinobusunub.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377109a115d---59923374916.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/woxepatunuxopurijozab.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/21456292967.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/47922031478.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/dibilujoxadapiguf.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/subiji.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109040452273471.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/zoliwizavizukojodoxad.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/jajudi.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/89489606104.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/43700563012.pdfIn PDF document text
    • http://sun-eko.eu/files/file/mowagituwome.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420c92048c3---kuvuditezipekefe.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/dezaxadusa.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/2777164143.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb1f95d085---fukudububajumonupop.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/42624972381.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-7/20210907164903545641.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/30383719518.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136185cb902d---tesawazevavipixi.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/2790727944.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135eb4056f39---72567205026.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef3484522b---81190209480.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=amazing+spider+man+2+apk+download+for+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC767 11084 bytes
SHA-256: 2f3654747565574af5d5033a1de796d829b1f8d4bc84d9fdac2ef135c8029218
font_01_sfnt_off0000e126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE126 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF938 16444 bytes
SHA-256: 19c89de9f667fdc2ddf8b963777bee8d3eaf8b3b7aace82e42a1fc4a7c6a3571