Malicious PDF — malware analysis report

Static analysis result for SHA-256 94c54307b6efa877…

MALICIOUS

PDF

71.1 KB Created: 2021-09-01 06:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ad5e8bac0860bdf4b43e3b8c66770dfc SHA-1: d7d4dd141efc7656d9c6233e4a324e02c1e5416d SHA-256: 94c54307b6efa87796095edace58ef3831fefd6c62992d4164f253f371627993
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document's purpose is to trick the user into calling a phone number, a common tactic in tech-support scams and callback phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a140d7f7f9---27485139019.pdf In PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/vuvobet.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9cde3f1f7---85600843576.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/dutosopibu.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/e716663d4cc64cfc7ccca54da0df7617/10533474104.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/680a17f6c6c0414554439f5db6d02087/23061527229.pdfIn PDF document text
    • http://www.heksan.com.pl/file/20875044954.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/85935720245.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/36865428259.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f90b00d825---jepasipaw.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/bepopetexawesazowarasi.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/48227550783.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/371aa1a287062b0170e1051760ff535b/rezarigaravix.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/90422604503.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c101880e93c---bimofo.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/ohm43gt8af3hcf83otpcnfmtel/matuki.pdfIn PDF document text
    • http://domainecomps.com/documents/files/58319272530.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/a50a6eec40be4bff779316b489e8054c/94530704488.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/3327775783.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/79a510967d601e256e52818dff64b322/96429461030.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/bcf95b8eda4ba2a15937f46d313d51ba/35417301295.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0e364cf9e---jepimakog.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/97380697970.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/56703701173.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=robin+wright+homePDF 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_off0000b59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB59E 10452 bytes
SHA-256: 66fc691c42e09fe9f0baa3cfb22f31d199e148d2dd2dc320dac9bb60e7b118b2
font_01_sfnt_off0000cd29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD29 16120 bytes
SHA-256: 2996cfe7e3958c3e1ea1fd9b9271363350f02434ae1b9c05795826611bd494a4
font_02_sfnt_off0000f6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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