Malicious PDF — malware analysis report

Static analysis result for SHA-256 39872b4c9d581979…

MALICIOUS

PDF

87.8 KB Created: 2021-06-26 07:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff8b5f8a5b925d0637bd422d9b988fe9 SHA-1: 52ec2916d9fbbf97ec5e19c93f2771065a10de03 SHA-256: 39872b4c9d581979603d3add57be3101c824839b026db58679474e52d7494d5f
176 Risk Score

Malware Insights

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

The file is a PDF document that contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites. The heuristic 'SE_CALLBACK_LURE' indicates the document likely prompts the user to call a phone number in a context related to billing, refunds, or security, which is a common tactic for callback phishing or tech-support scams. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://medvor.ru/uplcv?utm_term=book+appointment+for+drivers+licence+renewal
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1d1d96231---puvopul.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/36e4ded892bedeccda214fd318f4a62b/sebuzonorukisisubifedulop.pdf
    • http://elisa5888.com/shopadmin/upload/files/71982437566.pdf
    • http://thanuyentea.com/ckfinder/userfiles/files/zalisejovisuwafegi.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/e24tsubtciim3uqkerudjicm3g/metepopaloruduxo.pdf
    • https://myphi.biz/nbloom/fckuploads/file/74693340689.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/22eef6b586d8755bbc26e8dbc508945d/romisizo.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/2b0bf390313a62364ab6b53ea0b8e8a7/15566858976.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb48f78439---vulepuwazigagiriseruxo.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bba27c3a907---seduwogi.pdf
    • http://aliceinformaticasrl.com/user/pages/34376126037.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160768bd4d693a---zuvobobefoxot.pdf
    • http://capmar.eu/userfiles/file/20017010444.pdf
    • http://amctop.com/board_data/editor_img/file/202106232115.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837ac09bb4b---wemelalasoj.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a7560b1e---31769110034.pdf
    • http://ahsaipu.com/v15/Upload/file/2021541017413700.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/53657fa46e6ca00237ee4b2defcbbc72/19879050708.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/ka70b82gsnsjt77be8cov4igks/rusefarox.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d5145223d---25815701533.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a755a2c78---nupotur.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/qhcrctfl5ks86q1fcrf3b2q2r4/dujijidabodibu.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa49a9cea59---90621257163.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d4d99789f1d9fdd53aa30cf29e83dc59/59346028849.pdf
    • http://amdind.com/userfiles/file/85314335198.pdf
    • 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_off0000f028.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF028 16792 bytes
font_01_sfnt_off0001083a.bin
64005e1e682f7e53bbd4fdc3ef01247f97bfd7272b5c74103f5ce0f806fa6507		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1083A 17896 bytes
font_02_sfnt_off00013794.bin
cc4f35bdfd6d2e1ea38f34876043d05f334d735f225cbbc284c6c27aabe49565		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13794 11080 bytes

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