Malicious PDF — malware analysis report

Static analysis result for SHA-256 595f4976f130fe47…

MALICIOUS

PDF

83.9 KB Created: 2021-08-26 11:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 91b30b248e2f6632ba74fddba07bdb74 SHA-1: f96a978265b25926845ab638bd8a46dfe26ef27e SHA-256: 595f4976f130fe47c9fe8847a480dc90719384c77054fc7d1a32a355aa121fa9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress upload directories and other potentially malicious domains. The primary attack pattern involves directing users to these external sites, which likely host phishing content or serve as downloaders for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/732ee57d20347648c0fdfe43c68cbf2c/padiwarinaluje.pdf In PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dfbc14c9249---42523064607.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/hj6tljuurajeja869ibve0td06/pawag.pdfIn PDF document text
    • http://upbfassadenbau.com/upload/file/93612669557.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/23282659399.pdfIn PDF document text
    • http://www.trotasierra.com/plugins/ckfinder/userfiles/files/21515706147.pdfIn PDF document text
    • http://chapelguild.com/images/usr/30439153607.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a1c82ad7655f5555f65209bba52077d0/2309499114.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/iji6c7r4l8efkpicjeo69oopk1/sorevedodeto.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/zifiwosokusuvob.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770c14c952b---rasabu.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210811_8EFC4FA1FA4FDE02.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/26580365648.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/pojevovinu.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/66611589174.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/74216510191.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/6777e9bb7074b29e5b98757cd60933fd/masaka.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611cc41570b14---28844518572.pdfIn PDF document text
    • http://willowslakerhea.org/userimages/xusefazufexike.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/kagazajutusamotamogowi.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/timimipugub.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/44571658782.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/d288aca2076e4cc26ef81fa03c07c2b3/zelagagewemano.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721fe283e4e---77473879721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=sancho+transfer+news+todayPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/cbba352aa80df603967258973d8557c9/26233617916.pdfIn PDF document text
    • 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_off0000e3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FD 16976 bytes
SHA-256: 05d48625b8e09859e4c74ed6fb02bdbc4db4858c87c56c810240cf5af294877a
font_01_sfnt_off0001106e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12885 10712 bytes
SHA-256: e152427c7313db22ce8bab85534fd372eb3ba9fbc99029254450c19c868faa1b