Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ec2b72bb9a1ed5…

MALICIOUS

PDF

85.7 KB Created: 2021-06-28 02:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a329dea6dbbadf687b536776fd363721 SHA-1: 1dc8ccba8dc502c9426ca84558868156eb665696 SHA-256: f4ec2b72bb9a1ed5fbf8cfb7511ec4e501a2c43f54f0d785780e474ad5be2683
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple compromised websites, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing lure designed to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/18e814fc51db7373fa26cf7278794c12/59525708537.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b28738890b2---mavelibemeli.pdf
    • http://hart-metale.pl/gimnazjum/userfiles/file/rofawajosagikuvajufuk.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0744259f7---meresevogomopasavajatoru.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/82295350848.pdf
    • http://teleinwestor.com/userfiles/file/41457550201.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/9d696aa8d9d24c2050540fbf601e8caf/64897261113.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0acc7336f---78265604753.pdf
    • https://travelinnsuites.com/nbloom/fckuploads/file/timopanodu.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/d8554b3d4230c117fede5814dde835fb/xasuvig.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5b41513ac---26994370691.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fc87eaa2c---wexasegesupagoxoj.pdf
    • https://vyrukrc.lt/userfiles/file/sivogawujekefo.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/9a1edc6fddd225e52c1ca473520496d5/40185595123.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4056234ba---83290302263.pdf
    • http://argol-editions.fr/userfiles/file/60420443637.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/9q1nrr8e5j454socpsr5vd6a27/24973880126.pdf
    • http://targdenunti.ro/userfiles/file/soxijuzofaraxifukikot.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/555c8008d734aeca4b6b5001cb08e86b/jinifobuvabulodegixoma.pdf
    • http://vinmexindia.com/uploads/3250139005.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4bb6a18e5---depufesugewu.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/bopapeligesanarakirafug.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=convert+cad+drawing+to+older+version
    • 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_off0000ea37.bin
f881b2233508812312fe7865844e9f751c02d8fc6af7cb17d526f60dd9e2e6c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA37 10728 bytes
font_01_sfnt_off000102e1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x102E1 16792 bytes
font_02_sfnt_off00011af3.bin
413f4a3f98d08f9523e32a6c473ddcd761be98613c261fe11bc75d9df2e6990a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF3 17812 bytes