Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6f10f04a77a6d9…

MALICIOUS

PDF

88.7 KB Created: 2021-09-05 17:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0d913f5d9a33a72b8a41cd7365225cd7 SHA-1: 95e0a04169234853906101f8344940c89d313e2f SHA-256: ef6f10f04a77a6d934c39d57e39cb7a6a041be733750a9ea719bf2408e02c32d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and links pointing to potentially compromised CMS upload storage. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://studiogallerani.it/userfiles/files/jafigakogije.pdf In PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b39f3c3c3---ranobedubamisufupim.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/58paqa9ff4643iefahg4svnn50/41289160409.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/farumitugesexarurawoji.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16077092785251---2797938592.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608abb4e34773---wobujedapaxaredipujadoxon.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/8852811447.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/kenimewuvavebazajujoxil.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/zunadanuzaxevelixoleba.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/22465281886.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/valaximepis.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/31315186641.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079e6020b60a---kapajutojebelepanezeke.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/83681114991.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b364a351127---sigonotarolaweselujol.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/panufalefuni.pdfIn PDF document text
    • https://eviinstall.com/userfiles/files/pamakajovo.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ng9hpt2gonurnsrt6nfp04lip5/94929208385.pdfIn PDF document text
    • http://wajl.net/img/file/2021817383.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/32362115803.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab00227623---36928143384.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/43d4f1b1d894cb9a0647e530c3bc7e5b/zuzobipulisuzuz.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/6ebdb4d9ee8018dc2a73a67f5e1768a6/82484831871.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/292a5737204087a8fc531eb50ded108d/bofuxomepaxu.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/79865483784.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=ionization+chamber+pdfPDF 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_off0000f67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67A 10824 bytes
SHA-256: 0ca5652f5ab34fd653880ab7ce7e96db9371c0bef05902a071a4b14a2a5031fe
font_01_sfnt_off00010f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12718 17804 bytes
SHA-256: 8f8cc4c7a23a6ee46534f4cf3b76d83f7d5b5fc2c7c86e153eaaf456140cab9d

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