Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fea224a234374dc…

MALICIOUS

PDF

68.6 KB Created: 2021-09-29 05:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2ef24983ce2d50981020647da69ed742 SHA-1: 83f61316e8d88888dbe43e905b4fae8b3c8b48a1 SHA-256: 9fea224a234374dc862b25719846fb4568ba26f62e194af766e97895e641fbff
216 Risk Score

Malware Insights

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

This PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a link farm pointing to various PDF files hosted on potentially compromised or disposable domains, suggesting an attempt to distribute further malicious content. The presence of a 'Password-protected archive handoff' heuristic indicates the user is likely instructed to obtain a password to decrypt a payload, a common tactic to evade initial security scans.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://vinacoma3.vn/userfiles/file/tujuvixezajibusixubetu.pdf In PDF document text
    • https://rougezenekar.hu/files/file/70577097947.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614576459ac26---feluti.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/12513205447.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-20/20210920083328721163.pdfIn PDF document text
    • http://secretinvitation.net/images/files/24907060128.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/99057132815.pdfIn PDF document text
    • http://sangsangins.com/upload/upload/file/jorerulowage.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/pojuzus.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/silumusakudif.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/fotikepanexepure.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/velum.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614daf0d5f48a---kawabisisipamusexake.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/3704978815.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/67022865345.pdfIn PDF document text
    • https://777mto.com/contents/files/99071661529.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/xufoporosuni.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1632215323.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/nedugujuzedogiwefiju.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/tadeserejenawixagaxanovim.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/gudiresixijosaku.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/20704986796.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16146f4a2246cf---toveranevowulixumev.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/kaladisemewiwozekiwajanoz.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/d0bebebf73bcd14e4aa34daa94fbd9c3/zobewabuni.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/fixenorojurumerafiwesaluj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=tanki+online+hack+scriptPDF 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_off0000b131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB131 13764 bytes
SHA-256: 80c36c68491ec31121c2d36d588ab3aebee3c6289abaadff5f5ede64c988bd2d
font_01_sfnt_off0000d367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD367 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7E 10528 bytes
SHA-256: bbea097d95612d3374a01e6b3d3d28b17d710ed634dffab20001149f2f3441ba

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