Malicious PDF — malware analysis report

Static analysis result for SHA-256 effadec9797a3c30…

MALICIOUS

PDF

91.3 KB Created: 2021-07-26 05:21:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f990508bbb77c67d4d643fe2286d3215 SHA-1: 076d969131f8b3ddc901717cf2db83a19a2d3164 SHA-256: effadec9797a3c3067c2f3355bac548c56c4016f84344dfd1de8ccb45d5c5e7c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS upload storage or disposable hosting. The heuristic 'SE_URGENCY_LURE' suggests the document may contain urgent language to prompt user interaction. While no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://gastrotest.co/ckfinder/userfiles/files/zexunore.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/73c872fbc23ecc88996f7336bb04bf24/zotamuraraguretaza.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/c89f803c7ea0fed39f787f1e232e8554/1085758014.pdf
    • https://ludifrance.fr/userfiles/file/maxurobobusuvilolome.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ef849aeb3---8846500800.pdf
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/kukukipufawanoga.pdf
    • http://cdmvt.cz/sites/default/files/zevebogijopone.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/lb1ujekinl4bjnth8q4vlsamoj/damemamiwexabutejuxipa.pdf
    • http://nemdanangpho.com/uploads/2021-05-29/images/files/diwutefarugagenuvita.pdf
    • https://ms02bet.net/contents//files/mikolive.pdf
    • http://alpha-cp.com/userfiles/file/bevota.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/a218dd0082c9f23542220f283f4fb39b/xivitegi.pdf
    • http://dytac.hk/userfiles/9133723641.pdf
    • http://bayernglobal.de/userVZ//file/gevumapekaxoronedojasanix.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c589a70dd7c---57644450754.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04d091ae91---wagametetiwafu.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/8fdfd3a18360615106138e512482bc54/57539525241.pdf
    • https://loctra.net/userfiles/file/78415983042.pdf
    • https://alarouba.com/ckfinder/userfiles/files/luleragojujojaza.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/afc381e44d89dd682dc73897b13d3290/86885698356.pdf
    • http://ecovn.vn/uploads/news_file/metavululolitolemapinexe.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/f89c09a2ac1c4ab6527b3663a525d76d/gexakepibezug.pdf
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/12677304028.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=nordictrack+commercial+2450+shipping+weight
    • 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_off0000f974.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF974 16792 bytes
font_01_sfnt_off00011186.bin
aa9d833c8670139826cc488600ee7e0fb3c2a27f42bfea9f92ccc21846ff7aeb
pdf-font-stream PDF embedded font (sfnt) at offset 0x11186 19012 bytes
font_02_sfnt_off00014340.bin
9f632fa657e83ea083ab1f6b2d297ab7b27e4474a1c7245baf7334f3bb69663b
pdf-font-stream PDF embedded font (sfnt) at offset 0x14340 11572 bytes