Malicious PDF — malware analysis report

Static analysis result for SHA-256 94fcc772e13623d9…

MALICIOUS

PDF

85.4 KB Created: 2021-09-06 11:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c500dab8293d1336d940cf5813412de1 SHA-1: 40d74ca74496407412cfd80887f042809f919b0c SHA-256: 94fcc772e13623d98b42e777eef39b8d3cfe58cc33772c4a0d48b9a232e881ea
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and a link farm heuristic indicates the PDF's primary function is to lead users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://security-m.jp/tool/images/file/3861562336.pdf In PDF document text
    • https://mmszke.hu/files/file/sevilusexov.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba789f87cb4---6636819444.pdfIn PDF document text
    • http://armanetti.com/images/xaxurezaru.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/69114452872.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/81917350298.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/nunepuvavelapojul.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/au01lgu98og3dlql4k4866uh74/32866756314.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20215141651273795.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a89115d07f6---56690184473.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/bcb1edac2b17e9ff75ae97362cb3e755/logamesupiwejesonej.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/35312696594.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/53350862244.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609251fb39bce---zagil.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160d2d96840fd8---72899837859.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/0acba568eaddb23ddf0b13f359f27d7b/fenitafazeri.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/59864535354.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/53687474464.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/venutexesa.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/050995c7e909e794d99f3e56b0d79d19/11700413122.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/41325144013.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/dizukofusotovapogedokepa.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/9146ba432cbf3d2a665aa203cb905a1e/nudivugiragoj.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/1c8f4f43874172bea862c890501452ea/nuwedelebasovezakal.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/7108510820.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/bububebipeso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=brief+history+of+psychology+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_off0000e762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE762 10800 bytes
SHA-256: fa22865d73be07e0fc4e2b08aab2f566c660f6955bd155d65cf5a6894aefba1b
font_01_sfnt_off00010040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10040 18392 bytes
SHA-256: 7f9fd2732a89caade6814c29da83e79fdf5a4a5604bb6f880ed799d24c21617d
font_02_sfnt_off00013025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13025 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1