Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea569ce79cc92a51…

MALICIOUS

PDF

107.7 KB Created: 2021-06-25 12:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a73ea207566c0099d58b631f38a8a718 SHA-1: 1ca10fa45041090aeb407a870ba4ff7d629bd5ea SHA-256: ea569ce79cc92a51ab20c48a5f07f051b08f7abef9751387dbc058bd666290cc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the heuristic findings clearly point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://archism.ru/uplcv?utm_term=acrostic+of+leisure
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1df85dc471---wixuwif.pdf
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210605_F68299F02837190F.pdf
    • http://ray-king67reunion.com/clients/41562/File/92271447791.pdf
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sufef.pdf
    • http://kartywspomnien.pl/uploads/assets/file/51209002816.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/lu7l6ega5h415mfenvtde3ieso/66024537395.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd3813dd69---23308792384.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/f0342f5a672e036b730293a4f0507cde/juwitufewume.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/f5c6ca0d94b8b0ea7d8eb678dbc91930/xemopogokaxo.pdf
    • http://sitepride.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/34321119727.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cf46d2325---90519246599.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160838c977b968---50516321593.pdf
    • http://cpgny.com/userfiles/files/52771747966.pdf
    • http://cybernet.asia/UserFiles/File/verajukalotipim.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/682bec0e42b3c2b719f9cc6a99c25235/64846430969.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/3c7d93da9e54ab7ada0ef460e5018503/76364696935.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d2d828825---morifesijejazan.pdf
    • 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_off00014254.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14254 16792 bytes
font_01_sfnt_off00015a6b.bin
4177e984402e8d665f06bc330d09b9ae28b2f1c410ed49fee7d6e1555271152a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A6B 10144 bytes
font_02_sfnt_off00017144.bin
a5754d3e9c0fac36128841027a4ec10a39383bc90a17ad59711f8fe0dde34784		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17144 18112 bytes

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