Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1d3edf4af1b1c70…

MALICIOUS

PDF

85.8 KB Created: 2021-06-30 17:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f629ec3685276f25d21237d42536cef SHA-1: bb0d03cbcfa3ede65913d1bcb130355a41ef1dce SHA-256: e1d3edf4af1b1c707876b78ba883dfcd752461a1229c9ff5121922054857beeb
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised websites, indicating it functions as a link farm to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically related to phishing. The presence of multiple links to WordPress sites with upload plugins suggests a common method for hosting and distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/1524ce7c44a77f3151d500ed083d7d47/farejezujozivizo.pdf
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/5b4c346861ffd70eabab983041058481/zubasadab.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d07f1c6a01a.pdf
    • https://balajitutorial.com/admin/userfiles/file/safopuvow.pdf
    • https://hmanagement.net/userfiles/file/nuxapebatanejuz.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160bc98ec6d299---mowopifinafajasawenizipi.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b027f127f---74044164970.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/4mfolar3ogd2v0c41148ufcuf9/43801743199.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c26b7cd314d---goruvinades.pdf
    • http://automotiveenergy.cz/userfiles/file/limaburojekupawugizunur.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160c71b33316eb---fatufimiki.pdf
    • http://katheran.com/clients/55933/File/fexezivifated.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/nbh3rcj13ls95olhb670k5skr3/37826457607.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c82f7f450---44741570026.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2b6154ea3---27185593817.pdf
    • http://citra.cl/userfiles/file/kalubokabibi.pdf
    • http://argol-editions.fr/userfiles/file/74477372653.pdf
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/jeqvq5kp26k2jci4l753nceja8/wugitekidefujakufadil.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1c2a07c84---jefaxizizoki.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/15733910289.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16089f3f6e28e0---75708545291.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/0814d06e833fdca79fa8431cd992d3ce/65551937989.pdf
    • http://robwalker.net/fckupload/file/9400810908.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=calculate+the+reading+of+vernier+micrometer
    • 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_off0000e963.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE963 16792 bytes
font_01_sfnt_off0001017a.bin
04ed413e2aea7008a9b2346150ea6b3d78e6a680f4d9b9516cd0217b505ee158
pdf-font-stream PDF embedded font (sfnt) at offset 0x1017A 10952 bytes
font_02_sfnt_off00011a81.bin
97ff7be52d2e25d51b6405950233dd63f40fa65187ebac58ba7a60c43a0cec3c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A81 17440 bytes