Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f2338500ae75e4…

MALICIOUS

PDF

78.5 KB Created: 2021-09-04 10:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8158a318c7c3a10dba9b3b9ece3f4b66 SHA-1: 081ef24a4f5aff2f89db4c298ed28bb3d2330b27 SHA-256: 56f2338500ae75e41618a7064bd4f9d3c7c7b41ee434102137dea8a83f67c68a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The embedded URLs and the nature of the heuristics strongly suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://orbitsecurity.qa/pro_mvp_tech/uploads/file/69631023501.pdf In PDF document text
    • https://equalitas.es/userfiles/file/60137170711.pdfIn PDF document text
    • http://jump360.co/upload/files/20210602151416.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/fukimabux.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/18881841397.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090e6f5c1098---80695428648.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/kimonulerapez.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d04d0db27---damazolorozosuwug.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/s7tegie6gsp35gb7jgv02eulua/15200335288.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/64635217669.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/5ddb5a23020701ae70af06aa8bf26fcc/28428335656.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/87176422858.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945b7ba12ef---4665970113.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/f5735b782c3fb6e447be5852a94cdaca/fovudidumufivubodopuf.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc279959cd---febomi.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87cf1af095---ravegejivero.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/lesobopi.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c334c715c69---56344490662.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161253595c1bdb---xanalaravolut.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/59462312662.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bdab0a04fda---sogumejawinigetorokikabo.pdfIn PDF document text
    • http://eibich.de/layout/bilder/file/tenenidopo.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/pevilenepadelesanokiwona.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/08832a7c164fca4266db6975c7bdabb6/90226729980.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=livro+filosofando+em+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_off0000c932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC932 10584 bytes
SHA-256: 7db47657c447c089a1c5195bd13db93ef2874dc3df4db291ac707fb8ee731c1f
font_01_sfnt_off0000e14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14A 19776 bytes
SHA-256: fee94c0a03dd0f205be419dca1f9aa7559299c1b8f9272e242c53c922c8b29a1
font_02_sfnt_off000112bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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