Malicious PDF — malware analysis report

Static analysis result for SHA-256 39a454fd5c01a731…

MALICIOUS

PDF

84.7 KB Created: 2021-07-24 00:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d9fb311956ef99f189845b98ca3b619 SHA-1: ec89e88df7087ee610daee7293bb5ef34bd30f91 SHA-256: 39a454fd5c01a731204e050fa4772ead1edf3f9e60fb42cbe1e178ed7ca614b8
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload storage, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/nl64tv8jv69mv6p7sjstn6ruc9/sudumilori.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607723bf7e357---nakeminimu.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/38d79af4c1ee9f04430c4100cba8d738/vawigiluvixerapovoxul.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8de59329f---91413363936.pdf
    • http://sevoir.hu/uploads/file/52360238012.pdf
    • http://asja-doll.ru/userfiles/file/5177777273.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712d78b7fd9---90887737532.pdf
    • http://files.ibiza-ferien.de/file/dewerijujosapowenokuvi.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160700d20e7d1e---24121559195.pdf
    • http://ubestsports.com/imager/files/20210616184735.pdf
    • https://secolink.sk/userfiles/file/nugubofesezigitisa.pdf
    • http://446888.top/userfiles/file/77602487687.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/uoqthsqhepbfufc7olkkpu6l7g/mesenir.pdf
    • https://novzelandiya.ru/ckfinder/userfiles/files/sizivelusin.pdf
    • http://healhumanity.foundation/userfiles/file/xavupitafajetes.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/87ac58ca9c1f1a1dc52442b3144d0141/vifilepowo.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/4244bbblve3kqkkt7b8nu1q8g3/87039071570.pdf
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/pazemolerugul.pdf
    • http://wmc21.com/ckupload/files/malumiwezu.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/17e1942b6d680a531088d05090240a4c/sewevamifemafefakid.pdf
    • http://domainecomps.com/documents/files/61564763122.pdf
    • http://kezmosas.hu/files/file/34755656729.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d860d791838---salawekupukakavinivebit.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607f35e91567f---lijuw.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/c26563d43839008fd863d561e237d21a/rotojifinejenedaval.pdf
    • http://www.tobywells.org/media/fckdir/file/zuxulalevuni.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=juegos+de+palabras+agudas+graves+y+esdr%C3%BAjulas
    • 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_off0000e3da.bin
7aa361a3fac7d2db58e8f222f409d4ec6b678216d87e9a7c5a93c45645c6d825
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DA 18152 bytes
font_01_sfnt_off0001110c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1110C 16792 bytes
font_02_sfnt_off00012923.bin
a8d25e836f02b30eef25ff08ee3d96183547a330597c89852b432098434346a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12923 10932 bytes