Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a1b9424d50d9e5…

MALICIOUS

PDF

88.7 KB Created: 2021-07-04 07:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fcfcf19ce4b3f9632423b6897deb20c5 SHA-1: 9d25ab5de8c3c06bb95000a16d0dd857af702bfa SHA-256: 87a1b9424d50d9e575dd4cee53197caa28cc5b802c9e193cb6da68d3af87587a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it's part of a phishing campaign. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, a common tactic in callback phishing and tech-support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://rainbowcaterers.in/userfiles/file/73880006882.pdf In PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/5t0mdqrpaett0mbe6c4dgrb612/zesilevodefosopebugoniba.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///24394747551.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8c3fc7e55---60837100062.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c872d122c87---47948009892.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160941d096fb85---nojemurinez.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/33f0b6eaf553b3c7cf034224888e65bb/nelesakoru.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/37793542885.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160db768126543---77524636687.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160905915a2cbe---wapiji.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b62c3cee0b1---13125610054.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609094ca19a5a---wuvimetazari.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/nsbvrubrdr8chl04eia6cavesf/35082287083.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/b8d1aec6cb1bdceb320e3b79c9afc7f8/25276145526.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0130e188d---99477673163.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/07e5a37307a5c69b8f0f8a151f498293/54523612886.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/5jmodqlig3o6eaomkf8ir0qm0j/nejinukafa.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb2eb2c13a---dixilotogifewameb.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609426e97ad63---gexopofipofipoxinivowij.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160adc03d418fd---49164650844.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/xojorevemasemunapusajolo.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16076cee5c02ac---95170812840.pdfIn PDF document text
    • http://toyotalongbien.org/data/dulieu/files/69515620014.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/30105620671.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=physiology+lab+report+examplePDF 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_off0000f5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E11 17580 bytes
SHA-256: d1bacbc0e1214409faf759b6f9ee1609e21600aeca9d365b385d16fd63df0d0e
font_02_sfnt_off00013c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C67 10952 bytes
SHA-256: 0ba43ae9870ae5c82b551df53d5b98dd09911d410b0fcd17cbd8e5adf63b26af

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