Malicious PDF — malware analysis report

Static analysis result for SHA-256 68461eba6482f4d9…

MALICIOUS

PDF

87.5 KB Created: 2021-08-19 11:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bee9c01888467fe369310c6a5afc23a3 SHA-1: 7b612d4767d9653e9c9e3874d37b7b47014d09d4 SHA-256: 68461eba6482f4d924bc574d900b0354f66e72dd8b15c2c0f4424f65b26ce37c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to potentially compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this as malicious, specifically as a phishing or trojan PDF. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the malicious intent of redirecting users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://wwpokebar.com/uploads/files/lakagino.pdf In PDF document text
    • https://takarasushimn.com/userfiles/files/41145948433.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/72358219697.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/11537233272.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/47633693870.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/77110340407.pdfIn PDF document text
    • https://wrd13.com/force/file/namujufexirivukuv.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/06aea3239452ad8e3cc21b05b8c4c087/fuzomu.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609200c4085ee---xuwofegizafige.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/kasazilu.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/fuwerilosejugusa.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c645abd4863---loxonaziwema.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076414d0746d---fawegiwaruseg.pdfIn PDF document text
    • http://scpt.it/userfiles/files/7313094128.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ce5e14150---51925976189.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/xoxavegelevarekubulel.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/k98j1l3drd83gaubs6dl4kujk1/deratizosu.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/zejat.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/vibogitifikape.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/49734219666.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba087ce3eec---39822845774.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/wijepoxutelugivexudifap.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e2f224e0614---ziwagijixavoxepixajus.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/f3c68c4e4d49e4e72086e6ad01f1cb4f/texelexanajifexug.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099aa0fe0f05---xubifelusivaneteja.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/xipizomiponowupajaxotar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=what+does+intercessory+prayer+doPDF 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_off0000f1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FB 17216 bytes
SHA-256: e8610f485057dd8c409f4940e2603a3760cf6a1876885c76fd8be13ff0f60be2
font_02_sfnt_off000136f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F5 10672 bytes
SHA-256: 02edffbb36ef78ff0d0bb25dd7375abcc195b3689484e76e65308966e4398a7b