Malicious PDF — malware analysis report

Static analysis result for SHA-256 e624628b8902fbd9…

MALICIOUS

PDF

89.4 KB Created: 2021-07-22 19:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 507d0f2e02ac2b98536185d96d06c71d SHA-1: 17654f1ab5181528b45255aefdd3f2393606223d SHA-256: e624628b8902fbd9e03ae63c95404eccacb110b3a29be3d639d98bd0ada42842
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded URLs and the heuristic findings point towards an attempt to exploit user trust through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/b0f2a246ce70305c97ec3c1af75cb2cb/kobinakigatosopi.pdf In PDF document text
    • http://csc0898.com/userfiles/file/20210714131706_ygm5mu.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/5975515688.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/29089165139.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be0bc660dc2---31124708021.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/lezosiwibazisuxem.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a3202c6d4a1---kedojonudajagekomotezu.pdfIn PDF document text
    • https://retta-bg.com/userfiles/80306834524.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/e90efce17e11d18e39dd1e9d3be662d1/49926565502.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/84137238939.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072af5047948---72689093788.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/saxixixe.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcddc65d03---fimebenibulexuguzor.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/26434388222.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/1keu69v8ors7vnffjb1ld88ccq/pifopefiwomatisamuje.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/48899899162.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072782ddf2d4---87617046261.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/2131741809c4e44e7c163ec8a6fba3be/depepotagoxek.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073e01b77f06---96238372580.pdfIn PDF document text
    • http://chapelguild.com/images/usr/femumunoritujim.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d12db24349---bivabogijudofate.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/rubititepigita.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/84361301795.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/87768090243.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=best+japanese+project+carsPDF 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_off0000f9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EB 10412 bytes
SHA-256: c37099d6920696cdbb535cd8ccfa84ceb083ebf2e1432246ec990accabe69fbc
font_01_sfnt_off000111b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B2 17356 bytes
SHA-256: f5206e7f9c88b22d9ce4c75e36a96ac3b1fd9c1b8d1f3ed592dbc3f5ae504f3c
font_02_sfnt_off00013f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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