Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b908feecbbb5811…

MALICIOUS

PDF

86.4 KB Created: 2021-08-17 11:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ee6d0ee7d439b3f7dcaa9baac39434d6 SHA-1: df836b82ce43c7e322722bb9761f458b3b3865b1 SHA-256: 7b908feecbbb581157f39d8883eb80bde46eb3684b2508feb8fb675dfe2054d2
156 Risk Score

Malware Insights

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

The file was identified as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm designed to redirect users to malicious content or phishing pages. The presence of these links and the overall structure strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://coretry.ru/uplcv?utm_term=como+se+forma+el+enlace+fosfodi%C3%A3%C2%A9%C3%A9stero PDF link annotation
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/726ee9d718b54879f52b76d2b162ac6a/29848751625.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/16473914027.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/63828801864.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a176594d4c2---24127570574.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/lpnd4drmhgo6km3bcjav85380u/57342296127.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/13772047205.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16118d29a97c3e---95935586337.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/44478230004.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/caa84789add84c921acb73ccf5ac0d17/53208322992.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/a012c8be88e8808ff6a5e26cfbe434e4/rovuvipoxesavog.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/pli52ec25uhmtpavht2r7s28o5/zewoliminujuvuditu.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/944320804.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608f56c411ec2---23707210342.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/romaw.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a3575b7a0bf---45773296146.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1611563d4a0493---37871542516.pdfIn PDF document text
    • http://absigorta.com/E/file/42961970934.pdfIn PDF document text
    • https://kimcert.net/E/file/darimurabokuviri.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/58021069720.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/d93a68d88b5e4ff13c56d9f86f4e908a/jirigurejojujemox.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_off0000e4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F7 19064 bytes
SHA-256: f6d03ed00cfb7be25d9e904c726a1b4031b14c5df6f738a07b1c362c7eb08152
font_01_sfnt_off00011650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11650 11396 bytes
SHA-256: 0a59a6c8e221141f39fbb3f27806e4b3b5c1defb0b58e59470f221f801be58de
font_02_sfnt_off00013068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13068 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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